Street or Race ?
Lots of Race responses, so I'll give a "Street"
We just put 10.8:1 static on some Ported Stealths, used an XS282S Comp Solid Flat Tappet with 1.6 Rockers... good for 587 hp/ 592 Trq on the SF902 with 91 Octane, 33* BTDC

Better to be a "has been" than a "never was".