The cam I have in my 283 came out of a 355 that I built for my 1984 crew cab 3/4 ton years ago. I didn't like the characteristics of the cam in that application and pulled it. I installed a Performer manifold and Performer cam/lifters/chain/sprockets, still running the 800 cfm Q-jet (original to the 454) and 3 speed automatic, 3.73 rear end, it was an amazing difference in operation.

1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy