Wow , only about 4lbs of boost and it feels like a different car. This is a very low budget build, didn't want to post anything about it until I got it to work. 1971 skylark 350 (over100k) swapped in 4 barrel intake, demon 650 blow thru, powerdyne bd 11, boost referenced the mechanical fuel pump, carb hat from pep boys, hose from ace hardware. The powerdyne was 300 bucks. It was from a mustang. Tried using the bottom pulley but wasn't working out right. Now try not to laugh, I bolted a v belt pulley to the powerdyne and mounted it where the ac had been mounted. The original length ac belt fit perfect with my homemade tensioner. The demon was a craigslist find for 250. When I took it out tonight I didn't have my air/fuel gauge working, need a new harness, so I didn't go too crazy with it but was amazed that it actually worked. Had been getting no boost then added another spring to my belt tensioner and that made the difference. Kept spinning the hell out of that one tire, 275/40/r17 , believe it has the 2.56 rear, now I need a posi. Even the roll on from 40 felt strong. Yeah I think I'm hooked on boost.