Need some help on this one! I have a Thunder Jet powered by a vortec V8. A good friend is going to purchase a Custom Weld 19' with the Vortec V6. My boat is a 21' and a V6 was not going to be an option for me. Those of you that run this powerplant.........any advice? He will run rivers like the Clackamas and the Santiam Systems as well as Lakes and the Columbia. No Boat brand bashing, just information on these motors please.