You can not tell if you bore your stock cylinders and run reverse dome pistons. If the kit you are talking about runs flat top 1200 pistons, are you changing the heads to 1200 heads? if so, they may look newer and cleaner than the rest of the motor. Here is a different conversion Bean does. http://www.v-twinforum.com/forums/showthread.php?t=53572
It retains all the stock parts and you cannot tell from the outside.
It retains all the stock parts and you cannot tell from the outside.