That was the first thing I thought of too. As your car currently sits there is NO room for the transmission to wedge in there. Your going to have to cut half the firewall and probably hack up alot of the shit under the dash on on the center counsel just to make room. Front and rear your suspension is going to be a issue. Your gonna mess the weight over the nose depending on your engine choice, so thats going to sit either higher or lower. The rear end might be just like the firewall. I’m sure they never left enough room back there to allow a diff and rear axle to go in without some major cutting.
If you really have 5000 to blow, take it to hybrid they can probably make it faster for cheaper.