Holley sniper efi

If you want to be successful you need to spend a lot of time and some cash with the fuel system.

I wouldn't do anything other than the Tanks, Inc tank / similar or the Aeromotive Phantom I have with a full return system.

The rest shouldn't be too bad. I don't like having the electronics as part of the throttle body. I also have a port system (Megasquirt 3) on my car since 2015. If you know wiring, you can make it work. For the megasquirt other than the "install" and some manual tuning for cold start and IAC, I basically fired it right up, let it idle in the driveway for 20 minutes and went to a car show with the auto tune on and then just kept datalogging and updating to get a pretty decent baseline and then smoothed it.

In my case the driveability is far better than even the well tuned carb I had and I got maybe 1.5 MPG from it. MUCH better when the engine is cold.