New engine issues

And to add, random thoughts. You still have not nailed down for us the timing, either cam or ignition. A local friend here had a hot cam in a pickup and it was a dog. We ended up advancing it "I think" 6 degrees with a multi-key sprocket setup . In other words, installing a cam "dot to dot" IS NOT always where you want it for best performance

Additionally, you CAN NOT get decent performance out of an engine with a hotter cam while A....using a factory unmodified distributor, and B.....not knowing where the timing starts and ends. You need a SHORTER curve in the distributor than factory, and you need a LOT more initial advance

There "might be" a lot to do in order to wring this out, whether it's a bad choice of combo or not. I'm not familiar with that cam grind but it sounds like a lot of duration for a heavy vehicle.