Whipple Supercharged Gen3-426 Stroker-1967 Barracuda Swap
Go for it! The main reason I ended up with a modern 5.7 Hemi in my car was because it made more sense to start with a modern design with all the efficiency gained from that than to try to build up older tech to the same point. A "basic" modern engine today will put out 400 hp, idle like nothing special, run for 100k+ miles, and not leak a drop of oil along the way. Plus they take well to modification. The stock heads on my 5.7 outflowed race heads from the 60s and only have more room to go from there.
Not to say that old stuff isn't still cool in its own regard. What you have obviously works, so on the one hand why mess with a good combo, but on the other, why not make it better?