I have a '70 455 carb. from a Riv.. Cleaned, rebushed & carb. kit installed. Not set-up yet. Pics here somewhere. I'll look & may have to repost them. $150.00 + shipping.
This is # 7040427, '70 Riv. 455. Camera would not focus on the stamping. Cad. nuts & bolts there only to allow me to assemble & operate while on the bench.
Carb. is a 750 CFM. I don't think they went to 800 until '71. How about $160.00 shipped. My guess is +/- $ 30.00 for Canada Post.