What's a good sprag for TF 727

I'm building a 727 and need to buy a aftermarket race sprag and would like to know what you guy's are using my car is 99% street use with a 514ci blow thru setup PT-106MM turbo in a 67 dart.

Let me know where to buy one or if someone on here has on that they bought and never used that you want to get rid of pm me with what you got

Thanks Mike