i am swaping my 302 for 351 ,i have read a lot of post on swaps ,why do most post suggest getting crown vic flywheel? my fsb is a 1988 with aod i looked up part numbers for 88 crown with 351 and a 88 fsb with 351 and they take differnt part numbers ?? i dont get it the flywheels are the same size 164 teeth with same pitch ,what makes them differnt ? shouldnt i get the one for the truck to be safe?