Just an fyi I had two small block stroker motors : the first was a R3 block at 408 c.i. with pretty much out of the box Indy heads , a 590 lift mechanical cam at 9.8 to 1 compression it made 502 tq and 527 hp and peak tq and hp was around 6400 , I sold it when the crank cracked. my second and current 410 c.i. 360 Magnum block 9.5 to 1 compression , ancient W2 heads and Victor W2 intake , 585/595 lift cam made 520 tq and 547 hp again peak tq and hp were around 6400