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278 Posts
In a 65 Bird you could have any engine you wanted as long as it was a 390:<) Not sure why you have over heating issues, my 65 390 is .030 over and has never over heated, that's here in AL. It will idle all day long in traffic. There are only three suspects for your issue assuming all is well with tune-up, timing and fuel supply. Water pump, clutch fan or radiator.
While the 460 is a good low end power maker I believe it is a touch too wide to fit between the fender wells. They come with C-6 which will present no fitment problems going in where the FOM currently sits.
While the 460 is a good low end power maker I believe it is a touch too wide to fit between the fender wells. They come with C-6 which will present no fitment problems going in where the FOM currently sits.