Sorry, I have been tied up for a couple of days. I like the old tried and true Carter AFB. They are not very expensive new, are easy to tune if you have to and just seem to keep working forever. But you need the right manifold, which probably means a 68-71 340 or an aftermarket square base.
The later manifolds for the Thermoquad are also out there, but from what I have heard, the Thermoquad is hard to get parts for and many have damaged plastic main bodies. You could put a Rochester Quadrajet on one of these manifolds, but I think the late factory carbs with Mopar linkage are emission carbs that have their own problems.
Another choice would be an early factory Carter AVS, which is similar to an AFB. I have read that Edelbrock is making these again, so parts might be just fine. But I have no experience with working on an AVS.
The AFB has always worked well for me and I have used them on several engines.