New Head and new problems

I just replaced the old head on my 4.9L because it was carcked about a month ago. Now two weeks ago it started struggaling to idle and accelrate.
I put brand new champion copper plus plugs in and gapped them at .042. With the new plugs it still run the same way with a black carbon build up on the plugs. Any ideas?? Thanks in advance yall.

I just replaced the old head on my 4.9L because it was carcked about a month ago. Now two weeks ago it started struggaling to idle and accelrate.
I put brand new champion copper plus plugs in and gapped them at .042. With the new plugs it still run the same way with a black carbon build up on the plugs. Any ideas?? Thanks in advance yall. Choke may be sticking shut.

I took the rockers off the new head and put the ones from the old head on it and it runs a little better (note LITTLE). I rebuilt the carb and cleaned out the choke it was drity but not the problem. My dad says it could be the timing or rings.

Yestarday it would run but not idle. Now today it will not start. It's backfiring when i crank it so i need to change the cam, distributor or timing chain. Plus the rings. I bought it in late 05 with 156,839 miles it's now at 170,000 miles.

try running som ac delco plugs or ngks they are the one i found my ford likes

Really sounds like bad timing or a bad distributor, specially if the problem is getting worse. Pending on your funds buy a new distributor. Check for bent pushrods, what yr? If the distributor is good the timing might have got off somehow at the chain.