Ok, I have loosened the rockers, taken out the spark plugs, replace the starter, coil, solenoid, ground and positive cables along with the battery. The engine will crank, but it is still very sluggish in turning over. I can see oil pumping via the pump into the heads. I have a completely rebuilt transmission, new TCI torque convertor, large bell housing, new 164 tooth flexplate. It seems to be running about half of the revolutions it should be. I really need to get this thing running this weekend, what could it be.