well if its any consolation,i had my 67 cuda running over the weekend,new motor i bought already assembled pulled the heads to see what was.[440 11.3,mild ported 906's.solid 640 roller,gear drive,the whole crank had been polished,everything looked good.]reassembled put in car sounded good,not used to a noisey gear drive,could here a a squeak that sounded like alt. belt took belt off no change,pulled tc to look at gear drive looked ok,pulled valve covers everything there look ok,started it up like this and i can still here noise but can't tell where its coming from so out comes the motor,i was planning on racing it this weekend but it's not happenen now.