The dealer and zone codes it was shipped to should be on upper left hand corner of the billing history card. Wallaceracing.com and ultimategto.com will have zone and dealer listings.
That is great news on the engine, with that car is where it belongs.
1968 400 Coupe, verdoro green, black vinyl top, auto 1969 GTO Judge coupe, Carousel Red, manual 1971 Trans Am, cameo white, auto 1970 Buick Skylark Custom Convertible 350-4(driver), Fire Red, white top, auto 1972 Buick GS Stage 1, Royal Blue, black vinyl top, auto