Help identifying/6
Whoops,, "T" is the series(model year), so Dan is correct. What about a shot of the fender tag, the line (170,270,GT) codes & engine options are there, will tell You a lot.
If You've got a 170 line that had a 170 Slanty in it, they might've decided to bump up the torque w/a 225 out of a wrecked '63 etc. etc..at the time, one never knows!
