and to be honest, I would consider it a sin to change the engine of the thing.
Nothing gives you the rumble for the money like the 120y
FULL STOP
Get some Mobil1 in, some WD40 here and there.
Ultra fat tyres, and chrome paint the front grill.
Get your car painted Orange, Purple or Black and get some stripes on. You donot need anything else.
cheers mate.