Ok I still have the problem of poping in the tail pipe. I have put in new carb, distributer, coil, plugs, wires, cap, rotor, petronix ign. with no change. Yesterday I tried a compresion test that may have put me on the right track. I got a reading of about 150 on all cylanders except for the #6 wich came up about 115-120? Is this a head problem or a piston ring problem? It doesnt burn any oil and I dont see any coolent in the oil. And here is the next big question. When I got the car I was told the motor is a 351W, Wich seemd to be right since the firing order was a 351, the intake manifold is an edlebrock 351W, and the coolant intake is on the manifold.....But the plugs are 14mm threads not 18mm like all the documentation I have read states it should have???? Could this be a Winsor with 302 heads??? or a 302 with winsor cam and intake??? Is it worth pulling the motor and trying to rebuild it without knowing what it realy is? Or does anyone have a good 351W/C or 302 for sale?