Which engine do you have? 218, 230, 237? Length of the head is the easy way to check, under or over 2 feet is easy to remember.
Probably a 218, IIRC. Keep your eyes open, if that's the case, for a 230, which has more bolts holding on the flywheel but fits right in just the same. In fact, you can change the crank, rods and pistons for a more or less instant capacity increase.
These engines replaced the 218 in 1954.
