Not all Slant Sixes are boring. Here's a Clifford Hyper-Pak-fortified aluminum block 225 that'll put a 3,000-pound A-body in the low 14s on pump gas. It is block number 49292. So far I've found three alloy Slant Sixes in SoCal junkyards, but no ZL1s. Special thanks to A-100 Jeff for his help finding this latest score.