[First c10]

I have a 70 c10 with a 2011 LC9 I was able to keep the stock compressor in the stock location. I did have to locate the stock blocks and adapt the ends since it was tight in the frame. stock ac blocks to the correct ac fitting ends I got from Napa.
Since my system was R12 I took my stock Denso compressor apart and cleaned with solvent to remove all the old pragoil and installed mineral oil and added r12 and the truck freezes you out. So if using the genV stock compressor make sure the Freon and oil is correct for your system. I am not sure if you have converted from R12 to R134a, but the Gen V stuff uses a different Freon I think. Sorry I have been out of the AC biz for a while. The gen V AC stuff I think is like R1234yf. Whatever it is make sure the oils are compatible or flush the whole system and use the oil that the Freon is compatible with. The compressor just needs lubrication and doesn't care which oil you are using.
I hope this helps!