454 would be nice with a 8- 71, generally, if you look at like summit racing and the blowers they offer, the 6-71's are listed for small block and 8-71's for big block, although I have never owned a blown motor, it would seem to me that the 6 -71 and the 8-71 are more of a street freindly blower and the 12-71 and 14-71's are more for a competition/ off road use application.