IDK where you can go in TN for the work or whatnot, but there are some different options you can do for the assortment that you may want. I have the ThumperRacing big bore, w/ both stage 2 and 3 cam, 12.5 piston, port and polish, Tb work, along w/ some vavles, arms, and more internal crap. It comes down to the price you want to pay. Boost Addict and 08700XX are both in the process of getting big bores I blv, while I think they both have done some other engine mods. Other than us, I dont think there has been anyone else to do the big bore kits. I've had mine since Augustish, but haven't had it on the Dyno, so am not sure what it will run. It really comes down to the amount of money you want to spend, and the durability you want with it. I probably have close to 100 hours on my build, and so far so good.