Angle iron (obviously aluminum is preferred) off the front drivers side tb hold down bolt, threaded hole, fine tread bolt and lock nut lined up with throttle linkage of carb/EFI.
Made mine from 1/4 aluminum angle. Forgot to mention: drilled a hole through the angle and the carb base plate for a roll pin. It won't loosen the hold down bolt that way.....
Also, I drilled the hole and tapped it at an angle, so it was 90° to the carb throttle linkage.
(Had a low 11s car I wanted to run at the bottom of a 12 sec bracket. I like to chase.)
