What torqueflight 727 transmission rebuild kit do I need????

Ok one last question. I know I've been shifting back and forth forever, but I think I've found the sprag I want. Any thoughts on the coan racing super sprag? I'm looking at this sprag because it isn't a 6 bolt, only a 4 bolt. The A&A looks like I may need a tool to drill out the holes. I'm looking to keep the internals around $600.