I've got my rebuild in and running, but still not purring like I want. It's a 74 AMC 360, .040 over, summit 8600 cam, crane roller rockers, summit digital ignition, MSD disributor and coil, edelbock preformer intake, timing chain, ceramic headers, 650 carb, port and polished intake, +.10 pushrods to correct value geometery.
I set the timing at 8 degrees BTDC, had low vacuum 5hg in drive at 650RPM, about 8hg at 1000 rpms, 15hg at 2000 rpms. Hard to start and running very hot.
I decided to alter timing. Set the timing in drive at about 650
RPMs, with the advanced vacuum plugged and a vacuum gage on the manifold vacuum. I moved the distributor to achieve maximum vacuum reading then backed off a little. I achieved about 12hg, but the timing was of the scale on the timing cover. I figure about 25 Deg BTDC maybe more. Running much stronger and smoother. A little detonation on hard accelaration. Starts much better.
This seems like a lot of advance, the stock setting is 7 deg BTDC. What should I expect the the above mods when timing and on the vacuum gage?