Joe, et al.,
In 1958 I put a 1954 261 in my 1953 Chevrolet 210. At that time, I did not the nerve (or skill?) to drill and tap the bosses in the early 261 block to accept the forward side-mount towers, so I drilled the front frame crossmember to accept a 1951 front mount, and used the stock rear transmission mount, with torque tube. The engine torque caused the engine to really twist, and the front mount failed a couple of times. The rear side mounts on the bellhousing might help. A couple of years later I pulled the engine, drilled and tapped the bosses for the three 3/8-16 bolts on each side. This gave a more stable installation. I also went to an open drive drive shaft with a 1959 three speed with a rear mount.
With Buffalo's adapters, you have even more options. Give him a call.
Does your 261 have the three tapped holes in the side of block? Is it possible the adapt them to the stock 1953 side mount towers?
