I have recently purchased 2 390's(a 63 t-Bird and a 66-67 car((don't know the model))...Both 4 barrel engines... What is the interchangeability of these engines>390>406>427 I know there was a 427 lo riser,medium riser and high riser.... What internals can be swapped around? What would it take to make a 390 a 406? Bore?,stroke? Different head designs? different cranks? I know its a VERY broad question..... but Looking for a few answers. I am planning for my new project .. 57 Ford that will be FE Equipped!(with a stick of course.) Thanks fellas!