TTi Headers,What Starter?
Early A's with TTI headers are a challenge. None of the factory starters will work including the 90's and magnum starters. The later model starters will fit with Doug's headers.
The McRob starter has the best record for reliability with the TTIs but it is a little expensive up front. The good news is that it is rebuildable and they sell parts for it so when it does need work, it is serviceable.