Hi, as far as I know, the '69 and later intake opening is the same 1 3/4" as the larger 240 and 300 truck engine. That allows you to use the 69 and up Autolites, and the Carter's from the trucks. Are you using a later carb now, or an adapter to put the smaller, older carb on your intake manifold? You do not say if you have an automatic transmission and need a kick down linkage. Personally, I would get a Ford style distributor. Good luck