www.autozone.com part # 3-78A Search for a '69-70 Chevy truck 350 4bbl.
These things are pretty cheap. I have bought a couple of them. You have to be careful with them though, I think they are remanufactured by cavemen. I had to return one of them and get a replacement, but for the $$, it is still worth the investment. I think I paid right around $100.00.