howdy folks, i have a 66 mustang with an 84 model 351 windsor and i have already built a 74 model C4 transmission. My question is which flywheel i need to use. It is the small bellhousing C4 with the 10.5 inch bolt pattern. So the guy at PTC torque converters said i need a 157 tooth flywheel. After hearing that i went and bought a flywheel for a 75 ford granada with a 302 and it is a 157 tooth flywheel. i know everything will fit but is the balance the same as far as 28 oz and 50 oz? I still don't completely under stand the years between the 28oz and the 50 oz balancers, flywheels, internal, external balancing on the engine its self. help is appreciated because i don't want to install this thing and and it not be right the first time. thanks Jimmie