340 issue after camshaft change

Scody21 said

I get it. I said in post 2 to pull the intake and front cover off and see what the heck is going on. Clearly there’s some issues, and a bunch of really smart guys here have thrown a ton of info his way. I’d say the best thing would be the the OP to step back, regroup, read this thread, figure out if he’s got a LA motor or Magnum Motor, take a deep breath and pull the intake/ timing cover, lube / degrees the cam, pull the oil/ distributor shaft and get the thing set all back to zero...

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I agree on degree the cam to verify. If it is off the problem could be an issue with one of the timing gears. A 340 will be a LA engine as the Magnums came much later. And I made a mistake thinking the OP has the 7/16 7/16 rocker studs. That is another poster.
Once the timing is verified by degreeing, the adjustments can be gone through again. I feel for SabreMech as pulling wrenches for 25+ years I have had an issue now and then that required going and having a coffee before wrenches started to fly, like when I was younger. I have a tool box that has a hole where a needle nose plier stuck in it during a fit of frustration.
Rarely is a cam grind done wrong these days with CNC machining used, but it can happen. If the timing is off, I would check the timing set on a known quantity alternate engine that can be degreed and then swap in the suspect timing set. Whether the timing set or the cam, send the incorrectly manufactured part back for another or refund, if that is proven the issue.