Transtar Industries in Madison Heights Michigan is close enough to you for those gaskets. They sell stock rebuild parts as well the performance parts.
TSR has really nice upgrade parts as well. Their billet band apply lever and strut are excellent. If you have future plans for upgrades you could add that kind of parts tp your order to get more value out of the shipping.
That handbook by Carl Munroe is very good to have as well. If I remember correctly I found an answer to a question I had about later 727 lip seal differences in that book that I did not find anywhere else.