OK, so I just bought the '93 Chev conversion van for the 350 TBI/4L60E. I called a builder buddy to get his input on swapping the TBI for a carb, and he said, "Why on earth would you change it? Just use the whole harness like you've done before, and don't worry about it. You'll have everything you need, and it'll be WAY nicer to drive." Of course, he's right.
Now I have to decide whether to use the vans front susp. and rear axle. I'd made up my mind I wanted a dually, but given the extra unsprung weight and increased fuel consumption, maybe the vans rear and front end would be a better idea. Not to mention it'll drive WAY better than it would with duals and one ton front, or the original straight axles, my other option.
So, now I have plenty of parts to pick from, and I can decide the best way to go this fall when I tear into it!