What would be correct for a 69 Roadrunner with factory power disc brakes? I see master cylinders and brake line sets for engine side outlets or fender side outlets, anyone know why or what is factory original ? Thanks for your help

A 69 with a 383 would have a Bendix setup and lines exit to engine.

I agree, but I have seen an exception where there has been the "hemi style" where it exited out to the fender. My friends 69 Charger SE has it exiting out towards the fender and not towards the engine which it should have been. Could have all come down to what they grabbed or had available at the time. But, the general accepted one is engine side ports unless it is a hemi car.