You can put in the new bearings and plastigage them again if you want, but the short answer is yes.
I’ve pulled my rod and main bearings and the part numbers both end in .010 U.S. which I assume means the cam has been ground down .010. My piston say SC 060 on the top and Z3251B6 does this indicate that they are oversized? I also had to use a ridge reamer to get the pistons out of the block. This seems like it might indicate the need for a rebore.
Can anyone point me to some photos of crank journals that are bad versus good so I can get a sense of what would require a regrind or just a polish? Can I do the polish myself with some fine emory cloth or would this put it to out of round?
Crank journals should be mirror smooth. You can polish them up with a strip of crocus cloth cut the same width as the journal. Work the journal like you were polishing your shoes…
THEN, using a micrometer, MEASURE the journal across 3 or 4 different points to make sure the journal is ROUND (not egg-shaped or tapered) . Record these measurements and compare them to make sure all the journals are uniform…
And yes, it sounds like your engine has already been rebuilt once, the crank ground .010 and the cylinders bored .060, which is the normal oversize limit…It is also normal to need a ridge-reamer to remove the pistons and rods. If the cylinder bores can not be cleaned up by honing, the block is junk and it’s time to move on…
Some online Ford Dealers will sell you a factory-new long block cheaper than you can rebuild your worn-out engine…
If that one mark signifies a .060 over engine and has a ridge then I’d say that puppy is beyond hope and you’re better off just finding another motor to drop in.
One would have to wonder what kind of beating that engine took to get a 60 over bore previously.