Has anyone out there had a rally-pac recalibrated? Any suggestions on an honest, knows-what-they're-doing business to deal with??

I was given (yes, GIVEN) an original rally-pac several years ago for my 66 coupe (just recently learned that the rally-pac is actually a 65 model, but who cares?!). Anyway, I found out a couple of years back that it's calibrated for an 8cyl - I have a 200 6cyl. The coupe is back on the road and I wanted to see about getting the rally-pac converted (recalibrated, whatever they call it) so I can hook it up and it's not just for looks, ya know? Any help is much, much appreciated!!
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2006 Deluxe GT. 5-spd. Black w/Dk. Charcoal cloth. IUP. Shaker 500. 8" stripes painted "satin grey effect".
1966 Sprint 200 coupe - Wimbledon White/red metal flake, red interior. 92,000 miles. 3rd owner (since 1989).