This is a little simplistic. The Lincoln has a double insulated trans. mount, two pedestals to a cross bracket, with 4 rubber mounts. Very unique. Tailshaft is also very unique.Newchapters wrote: I would have to get a new drive shaft and maybe move trans mount
Factory advertising states the '61 transmission was re-designed to fit the much smaller floor cavity, I think any transmission swap will require re-working the tunnel. As I said, anything can be done, but enter it knowing it's a big job, expect the worst.
$10,000+ for a rebuild sounds high, but not unbelievable depending on the extras, a stock rebuild should be cheaper.
As I said, I am not an expert on mods, but a '68 460 with a Lincoln C6, may be cheaper and easier, and a lot more aftermarket goodies are available. Floor work is still likely, but a '68 floor piece can be grafted in easier than fabricating from scratch.
It's easy to say what can be done, a lot harder to do it. Maybe you can look in the pictures gallery, and contact people who have posted their swaps. They can help you better than I can.
Edit; The 460 also has 2 bolt patterns, to fit either a slanted Lincoln C6, or later flat top one. The Lincoln bell housing is smaller, to fit the unibody firewall, and clear the heater. (Yes, I know that's not a firewall)