My engine is getting tired but still runs decent enough for now. I don't have complete build specs but it does have bigger cam, poston intake, full length headers, dual exhaust with h pipe, and 750 dp demon carb. I used an eBay HEI distributor set at ten degrees btdc. I have played with timing and jets and still have pinging at part throttle at highway cruise. I have adjusted the idle circuit to the highest vacuum I can get which if I remember correctly was about 14. I also have vacuum advance routed to full manifold vacuum. I'm thinking the primary jets are still too small. I think I have 68 in there now and before I order more I wanted to get opinions to see if I'm on the right path. Planning on doing power tour this year and want to get the cruising sorted out. Any suggestions will be appreciated. Thanks.