In stock trim that 500 cube engine in 70 and 71 churned out 425 horses and 550 ft/lbs of torque at 2800 rpm, and the engine was 100 lbs lighter than a 454 Chevy engine was.
We screwed one together for a 77 Blazer with 44" Super Swampers. Engine was .030" over, forged pistons, mildly ported heads, Edelbrock intake, roller rockers and a custom Mike N 800 cfm Quadrajet. On pump gas, thru the mufflers weighing nearly 8,000 lbs and standing 9' tall it ran 15 second quarter mile times. The engine peaked at 5,000 rpm but it tore your head off getting there.
A buddy of mine bought a Holsum bread delivery truck at an auction for $400 and turned it into a party van. He transfered a Caddy 500 engine into it. Not an easy swap, but he was dedicated to the concept. We had a kitchen table and 2 sofas plus a lazy boy inside.
We parked it on the beach almost every night.
