I recently bought a 1966 Mustang 289 C-Code Coupe with factory air and a C4 auto. I was under the impression it only needed a little work until my mechanic recently informed me that the rod bearings on the engine were going out. Because the transmission and engine are the original components and therefore about 50 years old, he recommended putting in a new motor and possibly a transmission as well. The car is by no means mint so I am not worried about originality. I am, however, on a tight budget and would like to keep costs as low as possible without making any major sacrifices to quality. I don't need a lot of performance, just a reliable daily driver engine. If the transmission needs replacing I'd be interested in swapping in a T5 or toploader. What kind of cost am I looking at for a basic well built carbureted 289/302/351 for daily driving, keeping in mind that I am on a tight budget?