Are you planning to try the 14b on the stock manifold idea or do you have an aftermarket manifold for that thing? Reason I ask is I saw you mention the E316G set up and, while that's really popular in the 4G63 community these days, that manifold isn't working on a 420A. ;)

Also, keep an eye on those stock pistons. Even with really good tuning, the stockers might only be good for about a year on 10psi through the HRC S16G. You won't be able to just stick it at 10psi with that turbo and assume you're safe. You'll have to do some homework on this project.

Looks like you've got things under control, though. Good luck and keep us posted.