302,327, and 350 all have a 4" bore a 400 has a 4.125 bore
302 has a 3" stroke
327 has a 3.25 stroke
350 has a 3.48 stroke
400 has a 3.75 stroke

302,327 and 350 all have 5.7" rods a 400 has a 5.5 rod

a 383 is a 350 block bored .030 with a 400 crank you can use a 5.5 or a 5.7 rod depends on which piston you use

the bore is the size of the piston, the stoke is how far the piston goes up and down in the bore.

hope this helps