A-body 833 trans, runner!

This transmission is in good mechanical condition, it has been upgraded with the 340 syncros and was in a great running vehicle before the vehicle was sold. It was kept for a project that never happened. Believe is a 21 spline?

I found an aluminum housing 833 (for my project '51), so this one is for sale! I would prefer not to ship it, I'm happy to deliver to Northern California for gas $. Looking to get $550 obo, well under ebay prices. Thanks!