Should have some numbers stamped into it somewhere. Most have it between 2 blades and normally have part number along with pitch like 21p or 19p or something like that. If it does not or is un-readable, I would guess 19p is a good starting point. That is what I have on my 96 2100SR with 5.7 and my RPM are good at WOT. I had a 21p at first but RPM was just a bit low (4000 at WOT).
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