572ci, same heads, I did get one strong recommendation for the edelbrock single plane 2x4, and one
strong recommendation for the Barton single plane 4500.

I have the 4150 Mopar/Barton on hand and plan to mod it to 4500 with some milling, then make up the lost volume
with phenolic spacer. Engine was fired with Indy 4150 single plane, but hasn't been installed in the car yet.
Also have Weiand tunnel ram to try later which should be fun.

If a deal comes along on the edelbrock, I'll grab one of those too.