[68 P.O.S.]

As Fbks said, check your throttle plates and throttle linkage to make sure they're not being cracked open or hung up. Also, you need to pull the carb and square your transition slots. Once squared and it's idling, attach the vac advance to manifold vac and the idle will jump up a bit more. The squared slots and vac advance will have your idle close to dead on. You'll only have to fine tune the idle to 750. Now that it's running you can time it. Again, you want 12 to 14 initial just to start. Your HEI should have 20 to 22 degrees mech advance in it. You should shoot for 36 degrees total timing. I personally set total by removing the advance springs in the HEI and reving it to 2000 rpm. This ensures the advance is all in and you don't have to rev it very high. Reinstall springs and check timing at idle again to see where your initial falls, probably 12 or 14. Reattach vac advance to manifold vac and you're good to go. Now that its timed well, recheck your idle and adjust if neccessary. Also a good time to adjust idle mixture screws.