This post from nearly three years ago says that Stack Exchanging is a viable option for troubleshooting gacks. Clicking the Upload button on a managed package is throwing the following GACK:
Error ID: 745113341-129879 (1384210970)
All code compiles without issue deploying and in UI with Compile link on Apex Classes page. All tests pass too.
Any guidance on the core underlying issue is greatly appreciated. Thanks!