This may be a little random and I appologize in advance.

I have a 1969 Chevrolet C20 (for parts) and a 1970 C10 long bed that I'm currently restoring / customizing.The 1970 currently has a crate 350 under the hood with a three on the tree. I am considering switching to a 427 would I be better off to stick with the 350 or would it be difficult to switch to a 427 (changing from a small block to a big block). I'm guessing ill have to change the rear end and transmission on the truck to compensate for the 427.

With the 350 I am averaging 3k rpms at 55-65 mph depending on the incline. I'm guessing with the current gearing and what not I would be burning rubber in third gear with a 427.