Popping sound in exhaust

dart_68 said

Update:

I got the initial timing down to 12* BTDC. I had to fiddle with the mixture and idle speed screws to get it to not load up. I'm thinking that the throttle blades were open too much but I couldn't turn speed screw down. What I ended up having to do was turn the mixture screws all the way in. The engine sped up then I turned the speed screw down to bring the idle back down to ~750. Then backed the mixture screws out till the engine sped up and then backed out the speed screw. Eventually I got it to idle where it will die if I close the mixture screws. It likes it best at about 3/4 turn out.

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You see what yur doing here?
You are trading transfer slot fuel for mixture screw fuel and twiddling the speed screw to make it work. This is normal. And it's a good thing that you started with 12* of timing, because by 18* it won't work any more, the transfers will probably be too far closed. Now you can probably hook the Vcan back up...... to the SPARKPORT,this time,lol. Then rev it up to 2200 to 2600 and see how much Total timing you have WITH the vcan.

As for loading up; something ain't right. I had a 292/292/108 Mopar cam,that would idle down to 550 with a clutch, and it pulled itself along in 10.97 starter gear, at 4mph like that; on flat level, hard pavement. To do this I had to dial back the idle-timing from 14 to about 5.
What's yur water temp; mine was 207*F