If you have medium low revs, stroker, medium heavy oil,
I'd suggest Element with strong drilling, possibly, 3.75/4" x 4/4.5", pin under bridge, with 2.5 - 3.5" pin-to-CG distance, weight hole at PAP + 1", as a starting point. Might need the slightest bit of polish or the VERY SLIGHTEST bit of Scotch-Brite nylon pad as an initial adjustment.
Just a rough guess.
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