Inliners show several 270 and 302 cams.

However, they also show other cams that work on both the 270 and 302 (your cam might work):

1946-1952 270 2136000 not used on a 302

1953 270 2191529
1954 270 2191529

1954 270 2192486
1952-1954 302 2192486

1955-1963 270 2326722
1955-1962 302 2326722

http://www.inliners.org/casting/numgame.html