Ben - The 67 and earlier MGB starter motor is a completely different animal than that on a 70 MGB. The early starter motors do not have an attached solenoid, they use an external solenoid mounted on the right side inner fender. For easier to follow wiring diagrams go to Advance Auto Wire at: http://www.advanceautowire.com/ click on Stock Schematics, then on MGB, scroll down to the diagram for your car.
Cheers,
Dave
http://homepages.donobi.net/sufuelpumps/