I've used Albuquerque Speedometer (New Mexico), the guy has been in the business since the 60s and is fantastic and reasonably priced. I posted his number in another thread or you can get it from dexonline.com


'51 Chevy 1/2 ton w/'62 261, HEI, offy, fentons, dual carter/webbers, t-5 & 12 bolt posi