Looks like all of them except Heidemann. (disclaimer - I looked all of them up)
Yes, we picked up Fermin from the Pirates. He was a .259 career hitter (4 HR's in his 10 year career). Fermin's worst year with the Tribe was .238 in 1989.
Veryzer - .241 career (worst with Tribe - .220 in 149 games, 1979)
Duffy - .232 career (worst with Tribe - .201 in 122 games, 1977)
Brohamer - .245 career (worst with Tribe - .220 in 102 games, 1973)
Heidemann - .211 career (worst with Tribe - .211 in 133 games, 1970 (although he did hit 6 of his 9 career homers that year <----probably was roiding) and .208 in 81 games, 1971)
The 1967 team had Vern Fuller (.223), Larry Brown (.237), Pedro Gonzalez (.228) and Gus Gil (.115).