looking for intake carb / manifold recommendations for 318 1973 La block

Agree with most everything suggested by Rumblefish in post #2. I would switch to elec ign for a hotter spark PLUS your ign timing is not going to retard the as soon as you start driving, which will happen with points. The points rubbing block wears, slowly retarding the spark which reduces power & economy.
Unless you can find a dialled in TQ, the 650 AVS2 is the best choice. The '2' has annular boosters in the primaries for superb throttle response & mileage. And a Perf intake.