[Jack21]

Do a little more research on this. Was reading one of the stroker writeups where the 347 is not so hot for longevety on a street motor. 331 is about the limit. Why not do a 351 stroker instead? The 393 stroker kit works fairly well. The Comp Cams 351 retrofit roller has nearly identical specs as the 303X FMS cam, but is ground on a small base circle for non-roller 351 blocks. Unstroked 351 with this cam has (as Wilf pointed out) 15" - 16" vacuum at idle, decent street manners, pulls like a diesel from about 1500 RPM, and a scalded cat from 3000.