[jimTN]

Bob is correct. Both `33 and 34 crossmember mount holes are closer to the center than 59 series mounts. Using the Merc adapters both offset the mounts and rais the engine so the crank is above the crossmember properly. I have a 59 series block in my 34 pu and every thing bolted in place with the Merc adapters and a sawed off double pulley.