Danr55 Dan I have seen 390 & 428 block with 427 caps in the block in the 2,3,4 postions. Bore and stroke are still the best ways. Numbers on a block can also be duplicated and acided to match a car original car that is worth thousands more if the original motor is in the car. I have a set of 427 caps with the correct bolts for a FE motor. I was going to use them on a 428 motor I have that turned out to be a 410 motor. It has a 390 bore and 428 crank in it. Yes I got screwed on it for not doing my OWN homework and trusting someone else.
Now I double check everything. Pictures of the motor would help alot but still pulling a head and measureing bore and stroke the old way is the only real way. Rick L.