470 vs. 500?

a friend of mine went 400 / 5xx something..can't remember but it was a Source rotating assembly.
put it in his "cuda dragster, set the timing at 34 and ran it at 2000 for 20 min.
Loaded it on the trailer and went mid 10's all weekend at Luskville in Quebec
..came home and put it in his street '72 Duster....it is a scary piece to drive.

i forgot about that one...