360 mopar wondering estimated HP??

Im using the same pistons in my 360 but with 63cc eddy heads and a .39 head gasket, I have around 10.5:1.

I would say a bit over 9:1, its hard to give an accurate answer because you don't know the chamber size, or head gasket thickness. But I think 360 heads are 72cc...not 100% sure about that though.

I'm using a bit of a smaller cam with my combo and I'm making a bit over 400hp, I would say you have mid 300s. Hard to say though, too many unknowns...