Dear Scrap;
I think Mr. Langdon's headers are designed for vehicles that came with a 250" engine from the factory, or one in that 'family' etc.
If you have a 250" in a 50 Chevy. you might need to have some custom made as the 216" was there first.
The 250 set he sells has the rear pipe angled rearward & that may not fit as the throttle/clutch linkage, parking brake and master Cyl. are all right there.
The 49-53 models are difficult to modify due to "all that stuff."
I would check the 'return policy' before you buy.
Good luck, John M.....