I had the same problem of finding the right pointer for my 302 block (347)
so i found a good method somewhere on the net that had me bolt a plate over the deck of the block with a " stop bolt and lock nut" welded in the centre of the plate. The idea of this is to get hold of a degree wheel, bolt it to the front of the balancer and then turn the crank over slowly by hand until the piston is stopped just before TDC by the protruding bolt into the cylinder. Make a temp pointer from stiff wire and fix it near where the Ford TDC pointer would be. Mark the degrees wheel at this point with a marker pen, then reverse the crank until the piston comes up again and stops. Mark the degrees wheel again. The difference between these two marks on the degrees wheel is exactly TDC.
I made a pointer from a pin and piece of brass to show exactly where TDC is.
This is easy with the head off, with the head on, you need a gauge down the plug hole to find TDC.