Triples is usually a silly idea. It worked back when engines weren't available much larger than 468 and the Hawk 501 was the beast motor. The other was outdrives- problems solved by 6's and arnesons. Triples meant another 1,500# in weight and the drag of the 3rd drive. Now, you can do the same thing with two mildly blown 540's and burn less fuel in a faster boat.
See your other post for some detail on Active/Express/Ocean Express.