correct seam sealing interior 66

The best bet is to compare to other 66 San Jose cars in a junk yard etc. If that is not a option you can see a illustration in the Ford Mustang assembly manuals (not to be confused with the common shop manual) that have been reprinted available through most larger Mustang Vendors . You should have the whole set but the weld and sealant book covers this specific question.I can only assume that the correct build methods are a concern to you and with that said the books answer so many questions and keep you from making so many mistakes and wasting time and materials that they have the best pay back of any tool you own . They are not infallible and various practices were slightly different depending on the plant but the manuals are right far more times then when they are inconsistent with what actually went on at the plant.