'76 400 in a '73 duster

Agree, very easy to over cam a stock compression 400. There's better choices than a Whiplash for power. I ran a stock compression 400 with template ported 906's TQ, headers, and mild Summit .466/.488, cam 2.5k vert, 3.91. Ran good for what it was. They're not even close to the adv. comp. ratio. You mentioned block huggers, brand? Several reports that they don't fit in a car chassis. Big block in a Duster there are only a few choices.