I thought so but was not sure, I have the RPM heads also. I am surprised you got that much power out of them but with 13:1 that explains a lot. I am shooting for 11.5:1 myself. Very interesting build for mostly off the shelf stuff and not a lot of fancy goodies. Can't wait to see how it pans out for you.
Hmmm...I sure wouldn't consider anything on this engine "off the shelf"...LOL
There's not a single part that hasn't been cut, ground, machined, ported, polished, whittled, worked over, fitted, pulled apart, reworked, re-fitted and reassembled!
Custom pistons, custom cam grind, custom pushrods, untold hours in the heads for bigger valves, intake ports "moved", chambers massaged, machined for T&D competition rocker system, intake reworked...