A while back I swapped the stock Quadrajet on my 79 Trans Am with an Olds 403 to the Sniper Quadrajet EFI system. I purchased everything through Chris at EFI System Pro and I cannot say enough good things about my experience with Chris before, during, and after the purchase. I would 100% buy from him again and highly recommend him. I have not horse in this race, just think he did a good job.
With this EFI, the shaker fits fine with no modifications.
Its important to note that if your engine is not running well, EFI is not going to solve your problems. In fact, it will probably expose additional problems after the install. You really need to get your engine "house" in order as far as timing, distributor, vacuum leaks, exhaust leaks, and so on before you install an EFI or you will be disappointed.
The components I purchased were these:
Holley 550-869 Sniper Quadrajet EFI System Gold, $1199
Holley 12-304 OE-Style Fuel Tank Module 79 Firebird, $348
ESP OEMODINSTKIT Install Component Kit OE-Style Module, $46
Earl's 100187ERL 100 PSI Mechanical Fuel Pressure Gauge, $33
Earl's AT100199ERL -6 AN Male-To-Female Gauge Port Adapter, $15
Holley 12-813 Mechanical Fuel Pump Block-Off Plate, $12
Driving impressions -
I was really hesitant to swap the carb purely for nostalgia reasons, but finally made the plunge and I am really glad I did. I did not notice any material horsepower gains (and was not expecting to), but the drivability is night and day. The car fires right up, idles smoothly, accelerates from a stop well, and is very responsive to throttle inputs. Way better than the carb ever was for me and I did have my QJet professionally rebuilt and tuned. I love the handheld "computer" that allows you to adjust the idle, fuel mixture, and other inputs on the fly. And it serves as a sudo-dashboard showing A/F ratio, timing, coolant temp, and a variety of other inputs.
Installation
This was not a one day job for me - I took my time and spread it out over a few days. Amongst maybe a few other things, you will need to drop your fuel tank, run new fuel lines, install an electronic fuel pump, wire that fuel pump the engine, remove the carb, install the EFI, install an O2 sensor, install a coolant sensor, run wires into the cabin, and tidy up the wires in the engine bay. None of this was rocket science by any stretch, but taking your time makes it look much better in the long run. If you add things like a new distributor or ignition there will be more work.
I recommend marking every single vacuum line, drawing pictures, taking pictures, whatever you need to do to make sure you know where everything came from. This will save you massive headaches later. Also, laying everything out ahead of time and having a gameplan is smart. Think about how you want to run the wiring, how you want to run the fuel lines, etc.
As far as the fuel goes, most folks likely buy a new EFI fuel tank with in tank electronic pump OR install an external pump with return lines. The Holley 12-304 OE-Style Fuel Tank Module made my life SO much better. This unit dropped into my stock tank and does not require a return line to the EFI. That does not mean its returnless, which is different. I highly recommend this unit for EFI. The one thing that took some time here is the module exits to the passenger side and our stock fuel line is on the driver side. You can either 1) skip the stock fuel lines and run new line straight along the passenger side to the engine, or 2) run a 180 degree bend and route the fuel line back to the stock lines on the driver side. That is what I did.
I installed my O2 sensor on the downpipe ahead of the cat and that seems to work fine.
Tuning was pretty easy and I am now starting to play with settings.
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