Budget tune 318 la

I think it would be a lot of work for very little gain.
I have a 73 teener just like yours. It woke up with; a free-flowing exhaust and headers, a 2800TC, a small-port intake and 4bbl, fresh cold air induction, and of course the icing was lotsa rear gear. Lotsa rear gear by itself was a major improvement. And so was the TC.