If I remeber right, you can look down the spark plug holes and tell the difference. The 230 has flat top pistons and the 250 has dish top pistons.
I may be all wrong here, but I remember reading that some place.
Try and find the date code on the head or block, the two engines used the block so the numbers will show both.
A manual trans will bolt right up with the correct bell housing. All inlines from the 194 -292 family will work along with the small block family and maybe big block.
Joe
