Re: doing a swap
I would first try using the factory motor mounts and frame brackets from the '70 and see just how much firewall clearence you have. You will also have to trim the top frame flange for both motor mount bracket and exhaust manifold/header clearence.....use the '70 frame for reference. The rear end will be a direct bolt in swap. Pretty much everything drivetrain and running gear wise in the '70 will transfer over to the '66.
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