Inliners International Forums General Discussion Engines 4200 Vortec, but is it worth it?

I'm intrigued. I've been looking online at wrecked TB's and Envoys. 2wd seems a little harder to come by, but the trans is the same as 1/2 LS trucks, so no big deal there. Even an early, stock 4.2 is rated at 260-270hp. I know from my TB, that you can run over 20mpg on the highway. Not too shabby when compared to a small block. My biggest complaint is that the power on my 4.2 comes in a little late(around 4000rpm) I wonder what uncorking the exhaust and stepping up the timing would do. It might just make an old truck run like a scalded dog.