I have built alot of them:
1.) 451 B1-BS head tunnel ram 525hp to the rear wheels
2.) 469 B1-BS head tunnel ram ?HP (NEW)
3.) 498 B1-BS head Indy Tunnel Ram (Max Wedge Port) 867HP @ 6500 rpm will make more power at higher RPM 7500rpm should be around 920HP
4.) 511 Indy-1 Head 690HP to the rear wheel