Quote Originally Posted by Beast View Post
What is the compression of each cylinder? If they are good then look for issues like timing due to lack of vacuum advance, or fuel starvation (blocked fuel line, miss-adjusted carb) or an air restriction (blocked or dirty air filter). Also check to make sure the throttle cable is not kinked and is opening the carb fully. I had this issue once and it acted like the truck was down on top end power. Once I found the bad cable and replaced it, the truck ran like normal.
Thanks for the quick reply.

Front 5 cylinders has decent compression~120-130, cyl 6 is ~90.

I've messed with the timing a ton, although I haven't verified the mechanical advance is functioning properly, I'll add that to my list. The original igniter didn't have a vacuum advance, I figured the distributor would be fine with it no hooked up.

I have some fuel line concerns from a crummy tank, I ought to toss my boat tank in and try to see if that eliminates the issue.

Throttle cable kinking is new to me, I's definitely have to check that out.