Hi new guy here I'll try to keep it short I have a lot of qs I took the top off my 427 int 300 hp my heads cop chambers have a stright eage with sqare corners on one side and my pistons have about a qarter inch deep dish the same shape as the chambers. I fould another 427 and pulled the heads thay are d heads mine are c s the d s have. A roulded corner in the chambers and the pistns are fully dished both are saying 300 hp? ? What do u think the comp ratio would be in these to set ups and what if I put the d heads on my engine? Eney help would be nice thanks.