$100 for the air shocks alone, they're 12" ones.
to me, EFI is simpler than a carb. I speak both languages and I've run both quite successfully in a variety of applications from stocker to boosted or bottle fed. I have a AFB carb on the rig now, but EFI is simply better for my build.... it's not the only choice, but for what I'm doing. It's better.
I've seriously considered propane (even looked at one for sale at the swap meet). I had a 75 Chevy 4x4 short bed in Reno that had propane power. I liked it, but propane has some detractions like loss of power (especially since the motor is already build for gas), and the elephant in the room - don't run out of propane, it's a pita to solve and finally, loss of cargo space (which was quite extreme in that pickup because it took 1/3 of the short bed for the tank).
From what I bought, the 950 commander is the most flexible system, the other system is the easiest because it's all GM validated stuff... so I dunno which I'll use, I'm leaning towards the Howards/GM system because it's so simple (even though it requires coming up with a harness).
so moving to the larger picture:
1) EZ EFI, I've run it and it's good for what it is - however, it's extremely limited because you can't change the factory-programmed maps. You can tell it to run leaner or richer - the problem is the system takes your advice and generally tells you to stuff it... on a stock motor, pre-80s, it works okay.... just don't run a hot cam.
2) EZ EFI 2.0 - at least gives you some programming that you can do... but neither can control spark
3) Howards (and a couple other folks including FItech) - they just came up with a cheap EFI system that the folks at Blueprint tentatively say is pretty good... as it's all GM TBI, I can't imagine there was much challenging the envelope - yet they both allow spark control through the efi.
4) FAST, Holley Commander, Megasquirt... all of these are very user unfriendly (to varying degrees), but they give you so much flexibility - including the ability to run the system closed loop.
I don't know which Holley EFI you ran, but the first generation (Pro-jection) couldn't run closed loop and required you to turn dials on the computer to set AF ratio and such... I used one of those, then didn't run another EFI for 10 years because of how terrible it was to make run. I also ran an AirResearch system in two forms - the original, and the system that was put out under Accel's banner... one of those times where the infusion of cash and tech expertise resulted a worse system...
One big thing to consider about the motor, was it EFI before or not.... putting such things as two temp sensors, knock sensors, and the ability to run a wide band O2 on an older motor can be challenging... and despite what they tell you, where you put each and every one of those sensors matter... to the point that you move the O2 sensor too much and you'll never get a good reading.
