I am getting a set of Thumpers with the upgraded valve springs. I was wondering if, based on my combo, it would be worth it to get the GT-40 valves?
> '88 5.0 LX Coupe, 140K, still speed density w/19lb injectors,
> Densecharger cold air kit, FMS 65mm tb, FMS 67mm EGR spacer, stock
>...