The Model Year '73 has -0- to do with it. Before I put together & swapped a 440 into it, this guy's '73 Satellite ran a 16sec. Flat in the quarter, w/a fresh timing kit; stock BBD, Mannys, 2.76's, & the base timing turned up a few degrees higher than stock........that Satellite was a whole lotta Rosie, with probably 20+# of rubber-mounted vibe dampening weights etc., didn't do bad at all mpg-wise either.