I replaced a 261 with a 283 in my 1957 TF. All the suggestions provided earlier proved true for me. I did change from a generator to an alternator. I didn't move my radiator back, but did install a fan shroud. So far that seems to work. Also, I believe the V8 had a different ignition switch to accommodate the lack of a foot starter. At least I installed a different one which according to the catalog was for a V8, and it is different than the original I6 switch. I used the original lock insert. I used a tubular "under the engine" cross-member which I happened to have on hand. You can get them fairly easily. Then I used the stock 283 side engine mounts, since my 283 was newer and didn't have the holes drilled for the stock front mounting. Also, you will need the carb linkage for a V8, you buy those also without problem.
Last edited by Donsz; 01/17/2011 3:27 PM.
