air conditioning and fuel tanks

[69ls4.8swap]

I have read thru some great threads and have gained a ton of knowledge, sometimes too much, on swapping to a 4.8 lq4 engine. I'm sorry if i have overlooked a thread on this. My 69 c10 is an ac cab truck and the 4.8 i am installing has a brand new ac compressor that i would like to reuse. I'm not in a position to put a retro system in and am wondering if anybody has used the ac pump from a ls to work with the 69 ac box. The ac worked great before i removed the 350 and i have capped all the lines and fittings so no moisture would enter.
Also I want to move the gas tank under the bed between frame but have the fuel fill come out behind license plate like on my 70 chevelle, and install a flip down plate. Any body make some suggestions with sender and intake fuel pump?
Thank you in advance.