As that was clearly the mid 70's I wonder why they wouldn't have run the 4.342" 400 block instead of a 4.25" 383 since the compression height of a standard 4.25" bore hemi slug wouldn't have worked in a low deck anyway...I mean why not just make a 4.34 or bigger bore piston?

All the talk of how much stronger the 400 webbing is (cold weather blocks etc) it seems like that would have been the natural choice. if you were going to build 360-390" motor anyway....just use a proportionally shorter stoke crank.

This is all very fascinating, it's always interested me since Greg Anderson cut his Pro Stock teeth wrenching for Hagan.