The Carter YF 2100S was manufactured for the 55-59 235's. It was specifically made by Carter as an aftermarket replacement for the stock Rochester B. It bolts right on and the linkage is an exact match. It is a manual choke. If you start to look for a Carter YF, be sure that you hunt specifically for a 2100S model. There are many different model YF's, and you'll want to find the one made for your '58 235.
Matt
