Index 6 to index 7 can be as simple as swapping freewheels and shifters (it was on my Miyata 512). That bike also has 53/40 Biopace chainrings, but the 40 is really hard to find.
One of my other bikes has 50/38/28, and I seldom use the granny ring. Works well on hills with the 13-30 rear.
The Centruion build will have 52/42 and 12-28. Another advantage to converting to 7 speed is the greater range of freewheels. Shimano, IRC, and SunRace all sell 'em new, and Sachs, Sun Tour, Regina, and many others can be found on the used market.
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You know it's going to be a good day when the stem and seatpost come right out.
(looking for a picture and not seeing it? Thank the Photobucket fiasco.PM me and I'll link it up.)