Hi Rouse
Just lookiing at your early hemi engine have you talked to the guys at ' Hot Heads ' as the bought the alum heads package from my friend Jerry Brady who built the heads in the 80's, they were for the 353-392 and Donaven 417 blocks.
At the time a lot of the nhra Alky dragsters ran them but now enough to make worth while to keep build them, and before the street rods deal took off
Just might give you some extra hp in your neat racer
Don