Well Howdy Don!
Sounds like you are in Navy country (Norfolk I read is largest Naval base on the planet).
I'll take a lunge at a checklist in no particular order...
1 Vacuum leaks. dont want any--Groove is a manifold vac. amplifier. find/ kill vac leaks.
2 pcv re-route. increases manifold vac. Extensively posted about all over site.
3 computer re-learn procedure--in training manual
4 spark plug gap increase add 20% to stock gap You prob. have no dist. so not much else to say for this car. I strongly advocate ignition upgrades where possible.
5 check your Groove w/ flashlight in dark room look for pinhole leaks light peeking thru check w/ bright flashlight inside looking at outside and vice versa. don't skip this!
6 If have access to OBD11 scantool you can check fuel trims O2 sensor data etc. Best to have done this before Groove so to compare to after. If not don't worry, but scantool is great diagnostic tool even if only used after.
So there's some ideas, oh and pics of your Groove, any idle air re-routing etc. are a big plus, more we can see more we can help, and help to teach everyone!
good Luck, come back again soon!
Tracy G