273 5 speed conversion to ax15??

Your 273 will love the 5-speed, but I don't know if I would recommend the install for a newbe, it could drag on for months. The 904 is a cheap easy fix and could be out and in ,over a weekend, for a newbe with a service manual and a camera.
Yeah the 904 is really bad. Tried to suck the check balls through the valve body, rear servo piston was destroyed, and I believe the rear pump is shot. I’m going to an auto restoration school so really shouldn’t be that hard with the resources I have to do the 5 speed swap.