Is the distributor on a '68 390 a standard mid to late '60s Delco unit? Is it the same unit '60s small block Chevy's used? Bottom line: I bought a Pertronix Flame-Thrower Billet distributor for my '57 Chevy, which has a '65 or '66 283. Will this distributor fit a '68 AMX 390? Thanks, Jerry Phillips Las Vegas '68 AMX 390