I put a 261 in my '54 Bel Air years ago and even replaced the torque tube driveline. My end gears are from Goetz (296:1) and it has a T-5 five speed also. Great to drive, smooth runner and good power. The only other changes are a HEI, 12 volt, and a two barrel carburetor. Oh, disc brakes around too.
Normbc9
