I know the stroke of a 400 is slighty less than a 440 (4.375 vs 4.750 I think), but the pistons are also .020 larger in size. Would taking a 400 motor, and having it bored out .010 and use a 440 .030 piston help bring up the compression? I know 400 lack compression because the pistons are so far in the hole, so would using a 440 piston help bring up the piston any? or is the wrist pin in the same position on each of the pistons? also i'm assuming you can use a 440 rod in a 400 since they take the same rod bearing, so would a 440 rod work with either a 400 or 440 piston? also if you can indeed use a 440 rod and bring the piston (either 400 or 440 if either can be used) flush with the top of the block, how would that motor run compared to a 440 with the same compression and setup? would the different stroke of the crank make that big of a difference?