That is one bad a$$ motor! I might keep an eye on those lifter bosses though. They look a little out there. Did that to save weight I imagine. Back then dual plugs was a bigger benefit chassis wise rather than power wise. Allowed 1 3/4" more engine setback by the rulebook. Course I'am a bit biased. This is my 430" street driven hemi. Post up some detail shots! Are those distributors locked together timing wise? Is the housing based on a mechanical tach drive distributor? Very nice!