Hopefully they're also replacing the cam and all the timing components and not just stuffing new lifters in it. If you're original thermostat is still good,re-use it,odds are it'll better then any new thermostat you stick in it,at the very least,get the old thermostat back,so you can stick it back in if your new t-stat goes bad in a couple months. Have your stock exhaust manifolds planed or sanded flat and install them with Remflex 6022 gaskets instead of installing shorties. Shorties no matter which brand you buy are famous for cracking,and they don't add squat for power.