Been do'n things to my Pontiac engines since the 70's to make them better. Blocking off the oil filter adapter bypass. Taking oil pressure from plug at distributer instead of oil filter adapter. Drilling plug at distributor for better lubrication. Tapping front oil gallory plugs and using pipe plugs. Adding an extra qt of oil(7 qts) on stock pans to keep pan from running dry on 6k burn outs. Deburing casting flash on blocks, heads, and intakes, etc. ARP rod bolts. Crower valve springs. Using hedders cause the stock system sucks moose cocks. HEI distributors. Customizing q-jets/rejetting for milage and preformance. Recuving distributor. Every one of these things make'm better then factory original.
Post script-script. My 67 is all original except intake, carb, distributor, exhaust, stereo amd wheels. But unless you did a PHS on it, checked casting #'s, you'd never know.
