Alternator, Regulator & E.C.U.

For about ten years my 64ragtop has been running on a hacked up stock points type wiring setup, with a two pin ballast. The previous owner had installed a solid state regulator to replace the old electromechanical one. He had also cobbled up wiring for a four pin E.C.U. Well, it's been working, but looking pretty lousy. So, I'm putting in a new wiring harness and don't know if I should install the '70 & up "flat pack" regulator, four pin ballast and five pin E.C.U. This also requires ungrounding the field that was grounded on the dual field alternator. Is the change worthwhile? Is there a performance difference between the four and five pin controllers, or between the regulators, or in using both fields of the alternator?? Thoughts and opinions are welcome. Results from the real world appreciated. Thanks!

BC