727 Assembly.....got some parts left over.....

Most kits come with a couple extra sealing rings that cover different yrs. I imagine it's cheaper to package 1 sealing ring kit with all seals rather than have 2 different kits taking up space on the shelves. It's normal to get a little air leaking because air will leak past rings pretty easy. The main idea when you pressure test is to make sure everything kicks in good and solid and you don't have a huge air leak