Look for fuel dripping from the boosters. A float set too high can drop liquid fuel making it run pig rich on a few cylinders and making the pop. The first video (cold) sounds like a vacuum leak or low compression on a cylinder. Spray some brake cleaner or starting fluid at the seam between the intake and head... particularly at the #8 and #6 cylinders. If the idle changes, you have a vacuum leak.Sorry for the delay guys. Finally got another timing light. Hoping this weekend or next I'll get to finally time it.
Last day I toyed with it, I turned the APT screw all the way out (richer), and it revved MUCH easier, and made the popping better. May be a carb tuning issue. A few day or so prior to that I smoked an ignition coil messing with distributor wires while it was running. Spent most of that allotted time pulling coil, testing, checking wiring and cap.
Hoping to get some more time/weather to dig deeper into all recommendations. I'll bet you I'm dying more It's been too long since I've drove the car!!
Correct- ran fine before intake AND carb swap. Carb is brand new Jet performance. Will check valve train after timing is set.
I should be able to visually "go/no go" the pushrods and bolt interference, correct?
Going off of memory, the only ones I likely kept in the same holes were the front due to alt bracket, etc. I do recall swapping a couple bolts with 'new' since there was either an issue with getting access with the allen wrench or box end. Been long enough ago I don't recall.
Correct on idles and WOT. It seems fine cold until the choke opens. Richening the APT helped out some. Leads me to believe it's a lean condition at this point. I shouldn't have to tear down a brand new carb, but stranger things have happened. I'll check into that and the other mechanical possibilities above once I get it timed.
Here's a couple videos from just before messing with APT. Didn't think to get any after. We're looking at a new truck tonight since mine was totalled Christmas day. If I have time after we get back I'll see about getting a comparison vid.
Triple check the timing, and double check that the piston is actually at TDC when the indicator says it is. The ring on the balancer may have slipped. As a quick way to check, advance the timing "some" and see if the problem changes.