Your opinions on what I should do engine wise..

I am in the same boat as you, so after much thought I am going to replace the engine in my 66 barracuda with a 5.2 magnum out of a wrecked 1999 van, the 5.2 magnum is just a 318 with a roller cam 9.0:1 compression and way better heads, an eddelbrock air gap intake manifold (or the cheaper crosswind chinese copy) and 600 CFM 4barrel carb