Not sure when it comes to the lokar setup. The stock rod setup has a slot which prevents the kickdown linkage from causing a bind at idle - how does the lokar setup deal with that? Does the lokar cable just go slack at the carb, or does the connector have some slack?
Mancini has some choices for stock-style or aftermarket return springs (you'll want dual springs if you ever want to try making a pass down the track): Mancini Racing Throttle Return Kit