kk got the 383 put together and in my camaro rs 1991 i kept my front setup and i removed my smog pump i still have my ac compresser was needing someone who knew what size serpentine belt i need so i can get it from parts store they don't offer a belt with smog delete so if u have length or part number it would be a great help ty (and the front assembly is from the lo3 305)

 

Maybe something in the following link:

https://www.thirdgen.org/serpentine

JamesC

 

Not sure if his reply helped or not, but if not, you basically have to take some thin wire(it works better than string cause it won't stretch) and route it the way you plan to route your belt, then measure it, just try to keep it as unkinked as possible...then you pretty much buy a couple belts each half an inch longer or shorter, and try several at a time till you get the right one, so if you measure like 80" for example, I would buy an 80, 80.5, 81, see if any fit, if too long, then ill take them all back and get a 79.5, 79, 78.5 etc....basically just kind of trial and error trying several sizes till you hit the sweet spot, and returning all the belts that aren't the right size. It's what I had to do for my AC delete 3.4 serp swap...