if both blocks are mark 4 s and should be if before 1990 .then parts will swap out all the way back to 1970 . i do not walk around with block numbers i do know some off my head the fast way is to just look at the block and crank hub you need a two pc re main seal engine .i have 12 in shop right now so i know them by look not allways numbers. you can look up the numbers the last one rings a bell