I don't know about the f1, but a 40 ford is very tight getting the exhaust past the pedal box area. I just put a system on my 41 pu and opted to go for a crossover pipe to the right and run a single pipe down that side, but using a 52 Mercury right side manifold. I did do it before on my 40 but it was very tight. One thing that is easy to overlook is the travel of the pedals, especially the clutch pedal.
Mart.