Need some advice on a 273 4bbl Throttle linkages

Pretty much any small block linkage will work....with a bit of modification. Here's what correct 273 4bbl linkage looks like....

Since you have an aftermarket intake, 340 linkage will work, since it's made to work with a higher profile 4 bbl intake.

P.S. ...don't drive without KD linkage...it will quickly screw your trans.(Kickdown" is a misnomer...its actually hydraulic pressure linkage....which is why you'll ruin your trans if you don't have it hooked up.)