Briggs & Stratton Frankenmower Advice

[linehaul_luvr1021]

Grandpa died and left a Billy Goat FM3300 with a blown 13hp Intek pullstart. I scrounged up a 24 horse Briggs (serial no. 49M777 0120 G1) from some high school kids' mud motor project and she's a little shy on electronics. I know I need: top cover, air cleaner, vacuum fuel pump, battery, wiring, and whatever other electronics that I'm not thinking of. Any advice is appreciated. Pics attached.

 

[Auto Doc's]

Not to spoil your project, but this bigger engine is serious overkill. Is the crank to correct diameter?

Frankly, I suggest nothing over a 14-15hp and stay with a pull start to keep it simple

 

[linehaul_luvr1021]

Oh I'm well aware it's overkill. I plan on swapping to dual tires with chains for some hills I have to mow, and throwing weights on the front end. As far as the crank goes no, its not. I need to order new pulleys, but I'm going to wait until the motor is running and I can get an RPM reading before I decide on size. And the reasoning behind the motor is that it was $100. Cheap as can be and I wasn't going to say no to that project or not.
thanks