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I actually took the air out of an 86 3/4 ton BB and put it into my 85 1/2 ton 350 SB that never had air. Took some time and money, but all being said and done, I think It's a better system overall, and also looks better.
If you get all the pieces for a donor it will work, you just have to mod the firewall as the non-AC vs AC truck firewalls are different.I also know people that have used the sure-fit and they like it also.