Re: OT, Diesel to gas conversion
In an '83 it should be the 6.2L GM diesel, although I've never heard of them being put in vans. My 6.2L powered truck ran about 300,000 miles before I rebuilt it. Not a great diesel but s#!tloads better than that 350 SBC based diesel they foisted off on folks for a couple of years.
Anyway, the engine should bolt right in. The diesel shares the same bellhousing bolt pattern and motor mount arrangement as the SBC. Depending on the emissions laws where you live, you will probably have to have to swap exhaust systems to get the catalytic convertor. The filler neck might have to be swapped as well to make it "legal" as the diesel will not have the "unleaded only style" filler neck. The tank will have the water in fuel sensor and the water drain petcock, but that shouldn't be a big deal. Get as much diesel out of the tank as possible, then fill it with gas. A little diesel in the gas won't hurt anything in a carbed engine. I doubt it would bother an injected engine either. You will want to pull the glow plug wiring out of the engine compartment just to clean things up a bit. The diesel engine wiring harness will not have any wiring for the gas motor other than the alternator and starter. The wires to the fuel shut off solenoid should work for ignition, but any engine electronics will not be supported. Might be easier to graft in the gas engines wiring than to start fresh. That's about all I can think of. I've never done it this way around, but I have done a gas to diesel swap.
72 CJ-5: 305 Chevy; SM420; D-300; 30/44 with 5.38's, Warn axles, and Detroits