273 to 383 swap

i've done (5) 273-318 to 440 swaps in b bodies by pulling the original 273 with its mounts and biscuits out of the existing k frame and installed the 440 with its mounts and biscuits into the same k frame on the same day! it bolts right in. i do it with the transmission still attached, all i have to do is shorten the drive shaft to make up for the 904-727 length difference. i realize doing it in an A body will entail p.s, manifold problems, but the 383 or 440 biscuits will line up with the k frame holes as they have in my b body swap because the biscuits on either motor don't change from car to car as they are bolted to the same 273 and 440 used in all chrysler cars