[Captainfab]

None of the aftermarket universal engine mount brackets are going to fit the '60-'62 frame correctly without modification. The '60-'62 frame is shorter in height than the '63+ frames. That may work to your advantage when it comes to exhaust manifolds/headers. I wouldn't go cutting on the frame just yet.

Since you have the ability to cut and weld, I would just get a set of the '73+ engine mount brackets, mounts and clamshells. Get the engine and trans sitting in place, forward enough to clear the firewall. Then cut the top of the engine mount brackets down to level with the top of the frame and weld a piece on the top to reach the frame. Are you keeping the torsion bar front suspension?