Vacuum or Mechanical advance?

I am converting my points ignition to electronic and was wandering what people are running on the street. My 340 will be slightly warmer than stock with an RPM intake, AVS 650, mild cam, stock exhaust manifolds with dual exhaust and 3.23 gears. I have seen distributors like mechanical advance as well as other vacuum advance models. This car will be street driven on weekends.

Suggestions appreciated.

Thanks