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First, I would look to see if the number above the starter is an F4 block. If so, it is a roller block
If it is, look under the lower intake to see if you have the spider w/ the eight legs to hold down the dog bones used to retain the lifters
To see what the distributor gear is made out of, if you have one already and because some are hard to tell by looking, you can lightly touch an inconsequential area of the gear (not the teeth) to a grinder to see how it sparks.
Cast is usually rough and steel is usually smooth but this doesn't always hold true.
You can look for colored marks on the gear: Yellow / orange - indicates steel Blue / purple - indicates iron
You could just buy a new steel gear for your distributor
Good luck
Have fun
With prices like these, I'd be at the junkyard pulling the distributors out of a few Mustangs and getting their steel gears
You can get brand new distributors with steel gears and a new cap and rotor on Rockauto for $60 to $90 (plus shipping)
Also, without looking further, you will be assuming you also have a roller cam and it is likely you do but some weren't.
Also, never know what a rebuild has it.
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