Head swap, did you check for proper push rod length? Did you adjust the valve lash? What about rockers, are they properly adjusted? Could a head gasket slipped while installing? Then again, did you torque down the head bolts properly and in the correct order? New head bolts? Way too many things come to mind that could go wrong just with the head swap. I'd still double check the distributor as the first thing, then work your way down my list.


Bill S.