Let's try this , I have a1966 273 engine with a 904 transmission . The crankshaft has the small registry hole for the converter. I have the correct converter and need a flex plate . My question is will a 1968 and up flexplate work or is the the registry hole in the flexplate a different size for the 1966 .
I believe what Sniper was trying to get across is the Flexplate "registers /centers) on the crankshaft "LIP" OD that raises anbe the flange and only needs to match the converter 4 hole pattern size wise.
And the converter Hub should match the crankshaft ID
