Here one for the guys who do engine swaps. How would you go about figuring about what's the biggest engine you can fit in your car with any huge mods just the usual (engine mounts, etc.). Say I wanted to fit a 523 Pro Street Series V8 in a 1972 Chevelle, or a 418 Ford Windsor V8 in a 1973 Mustang. What would I need to do to figure out if it would fit without heavy customization? Well, thank you.