1967 440 Barracuda

Just acquired a 1967 Barracuda coupe. Solid California car with no drive train. I have a 440 and 727 in the corner of my garage. How feasible is such a project? What do I have to look out for? Have a lead on a 8-3/4 out of a B-Body. Will this fit without extensive modification?
Playing around with a few different ideas here including the RB, a small block (318, 340, 360) or a modern crate hemi. Seeking expert opinions and open minded.