Steve-I did use an AF meter, but it was a long time ago and the only thing available was the narrow band type, which was better than nothing, but not much. Later, a good Samaritan (Dale O) who had a wide band AF meter, and had similar engine mods, shared his experience He recommended a KN needle with 4-1/2 oz red springs for "everyday use". He re-profiled it for a "performance" needle If you are interested, PM me and I will give you the profile.
I think Moss recommends BAG or BAE (depending on mods) with the 8oz yellow springs, i found them to be too lean.
If you are considering engine upgrades for performance, an increase in the CR to 9.5, recurving the dist., and then maybe an upgrade in cam, gives the most bang for the buck.
Berry