Welcome to the Forum, Leighton, and to the TR-7 world. I'm not as big a fan of the GM V-6 as others here, but I know that it has been a successful transplant for many wedge enthusiasts. It does make engine parts easy to find at any parts store.
The widest selection of TR-7 drivetrain, body, and interior parts is Victoria British. Moss Motors also has a smaller selection. Both offer catalogues devoted to the TR-7.
The Roadster Factory always claims it has TR-7 parts, but rarely advertises them very much. Their parts do seem to be of high quality, though, and they say they see a lot of them at their annual Summer Party.
You should also consider joining the Triumph Wedge Owners Association of America, which focuses strictly on wedges.
All of these places have active websites.
Enjoy your wedge, and if you need a fellow owner to come down from Maine in the dead of winter, do call!
Jeff
Jeffrey Aronson
P.O. Box 90
Vinalhaven, ME 04863
USA
'80 TR-7 Spider
'66 Land Rover Series II-A [2]
'66 Corvair Monza
www.landroverwriter.com