You must have a later model ST295 there. I've never seen that particular machine with the 4-chain set. They say the rear chains will wear out quicker on that system because of the full reverse bend, but I've never noticed any difference. The only drawback I know of with your chain set is the lack of clearance for a low center-of-gravity engine mounting.
Good Luck with it- how high horsepower are we talking, for curiosity's sake?
Stuck in the seventies- not in the swamp.
(6) Attex, a Hustler, a Super Swamp Fox, (2) Tricarts, (3) Tri-sports, a Sno-co trike, 3 Dunecycles, and a Starcraft! ...so far