So a couple friends and i have decided to take a fox I have and make it a super cheap open track car. I figure betwen the 3 of us, the car will be running dang near back to back for 2-3 hours. The current engine either needs to be rebuilt or replaced. Idea is cheap and reliable, so it doesnt have to be fast. Would we be better off rebuilding the engine with certain specs, or buying a cheap used stock 5.0 or gt40 explorer motor? As far as cooling the car already has a 3 core radiator and electric fan. Any other input would be nice.