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I have a USA spec '62 261. It fits in place of the 216 but I ended up using an electric fan because I did not want to fight clearance issues. The fan sits low on the block instead of up high like pre-'55 motors. I shortened the water pump and used a FOMOCO pulley that bolted right on. That has plenty of clearance to the radiator now, but the stock fan was sitting below the bottom half of the radiator so I run a 2000 cfm electric pusher fan with a thermostatic switch and it works great.

The only other two problems I ran into were the oil filter lines and the belcrank for the throttle linkage. The stock USA 261 has a full flow oil filter mounted to the rear part of the intake manifold, and it hits the steering linkage. I moved mine to mount to the front of the intake and got new oil filter lines (1/2" NPT). This takes the big cannister filter like the early V8s do, not the beehive type. All the oil flows through it.

The throttle linkage requires some bending and shortening of the stock pedal rod. After some trial and error I made it work perfectly. I made a new rod from the bell crank to the carb with some threaded rod and ball joint ends from the hardware store. The ball joint ends are just like miniature tie rod ends and are the best thing since sliced bread. They make the action smooth and tight.

Oh, and if you want to use the bourdon tube temperature gauge, you need a brass adaptor for some heads. Mine needed it. A 1/2" NPT male to 3/8" gas flare female did the trick.