Fenderwell cutting templates !

would these hedman 1 7/8" headers be to big of tube ? for a built 273 . similar to the d-dart engine. I think that had 1 7/8" tubes with a lot of slip on connections. I had 1 7/8' fenderwells on my 65 dart with a crate magnum sb 402 stroker . Nice headers !

my mopar Pictures 019.jpg