[JOE58]

That little 283 Chevy with power pak heads surprised a lot of people back in the day. A popular cam in 50s-early 60s was called the "Duntov Cam" which was designed by Zora and was a Chevy part available at the service counter. It was similar to a 3/4 race cam sold by aftermarket cam co.
With 2 4BB set-up, Duntov cam, power pak heads, low restriction exhaust system, in a relatively light wt. 55-57 Chevy (for its day), the little 283 mouse would run with the big boys.