the 7 1/4 rear isnt adequate for a lawn mower let alone a slant. i went through 4 of them behind a stock slant before i got my 8 1/4. if you plan on doing anything more than cruising get a better rear. the sure grip 7 1/4 might hold up but the open ones arent worth diddly.
I second this right here^^^ I've personally blown up a 7-1/4" with a stock slant and I've heard of and seen others do the same. Get a later 8-1/4" with bbp and youll be miles ahead of the game. 3.23 gearing would be a good compromise in your setup.