I got a sending unit with 1/2 line and 8AN feed and return from RobbMC. There is not one advertised for below 1965 on the website; I sent him a sending unit for a '62 and he converted it. https://www.robbmcperformance.com/products.html
I got my offset dowel pins for my bellhousing from them they were nice quality and they shipped fast. Rob even sent an email on Sunday saying they would be shipped right away Monday.