More efficient ac pump?

I have a fresh /6 on a stand....slightly built up, ready to go into my d150. At the same time I want to add AC to the truck which originally a non AC truck.
I have all the stuff for the dash from a parted truck that was factory AC. I have new lines for under the hood on ebay watch right now for my year of truck with the/6. I also have the lines from the parted truck, which had a 318. . I was thinking about cutting the crimps off and having new hoses put on the original fittings and re crimped if that would be possible, instead.

My question is, is there a compressor that will bolt in place of e original c-171 style, that draws less HP and still does a good job of cooling down the cab? If I'm looking at the possibility of having lines made anyway, it wouldn't be a huge deal to have them made to accommodate whatever compressor I might run. Just thinking out loud at the moment, I'm a ways out from worrying about ac at this point. Mainly body work and paint. I plan to have the cab repainted and to have the dash and HVAC parts pulled out while being repainted.