Racing Lawnmower Update

I got an Ariens YT12 is I didnt mention that in my old post. The Lawnmower is currently a 12HP Briggs and Stratton, I haven't done much to it other then replace the burnt fuel lines(the lawnmowers electrical caused a fire). I have torn the rear fenders off and battery box so where you sit is belts and pulleys, I got a free lawnmower with a 6 Speed Transmission(instead of a 3 speed high and low Transmission) and Im planning on putting that on the Ariens and putting the 16HP Briggs and Stratton Engine from a LawnFlite mower my father donated in the frame. The reason im using the Ariens is because the frame is lighter so I dont have to worry about much extra junk, The wiring problem is going to be easy to fix since The Lawnmower I got the 6speed transmission from has good wiring ill just swap the wiring from it. I guess thats it for now, Hopefully i can get another lawnmower from someone else to let my friend use to get back and forth between our houses(I think it might be a LawnFlite 5/26)