That would depend on which car, which motor, and which transmission.
1950 Chrysler could weigh 3500-4200lbs and have a 116hp flathead 6, but was tied to the fluid drive which killed any hope of performance.
A 1950 Plymouth could weigh less the 3,000lbs, and have a 95HP flathead 6 with a 3 speed manual trans. It wasn't considered a slouch back then, but it sure was not a rocket ship. Nothing in 1950 had very impressive 0-60 times, compared to the numbers of today, but most were not far from each other back then. Certainly a different time.

Want a surprise, look up the performance of a 54 New Yorker 2 door hardtop with a 331 Hemi, 4 bbl carb, with the much better 3 speed auto trans. In 1954, that Hemi 4bbl in the 2 door hardtop was considered to be one of the fastest production cars of the year.