[truckster]

I didn't want electric fans, because I like the thermal clutch on the SBC. I used an original fan shroud, but the 19" fan from the 98 Silverado wouldn't fit. I did some checking around and found that the same year of S-10 (4.3 V6) had a 17.5" fan. It almost centered perfectly in my shroud. I trimmed about 1/4" off and there's no interference.

The Quadrajet is a 1978 model, because I wanted the electric choke.

You don't need to "play it safe" with the fuel pump. You can determine if there's a fuel pump lobe on the camshaft really easily. Remove the blockoff plate and put a drift punch in there. Push it against the camshaft as you turn the engine by hand. If the drift punch pushes out as you rotate the engine, it's got a fuel pump lobe.