I keep an eye on eBay for the old TRW 2293's. Can usually get a set for under $200. I've run them in 3 motors now. Even dropped a valve into one. Just swapped it out and kept on truckin'

33 Plymouth Roadster - 383 - 5.90 1/8th 9.58 1/4
68 Dart - 340
66 Belvedere - 400

Windy Hollow Garage - https://www.youtube.com/@windyhollowgarage