I have an older, two barrel, cast iron intake, marine 302, not sure of the year but it has flat tappet hyd. lifters and a provision for a fuel pump. Can I identify the proper flexplate wieght by looking at the harmonic balancer? When I got the engine it didn't have anything bolted to the crank. I intend to bolt it up to a C-4 but I sure would like to get the flexplate right the first time!