Other FE motors (other than 427s) can be custom fitted with cross bolt main caps - so that isn't a sure thing to ID the motor. The side oiler 427s have a pretty distinctive
oil gallary running along the crankcase area of the block. Screwed in water jacket caps are another indicator as noted above. But, except for being able to run 24 hours flat out at LeMans, bragging rights, and turning 7000 rpms in every gear, there isn't much reason not to do just fine with a 428. At least that's my theory.