another ez question for you guys. I have a 52 V8 block with its original cam in place and I have a ,I hope 4" mercury crankshaft to go in it . The cam gear to the crank gears don't mesh togeter, one is reverse of what it should be. Could the crank gear be on backwards or do I have an older maybe 1948 crank and gear? The crank has the larger oil plug holes and with a ruler I measured 4" throw , but on the old paper tag from a machine shop it says 1939 ford ,along with the under cut measurements. Did the other flatheads have gear teeth reversed from the 49-53? HELP!! tony in buffalo ny