I have always been a huge fan of the V-8, but I really like the current engine that you have! Those engines are full of torque, and should be able to handle about anything you can throw at them. I know a guy who has been through 2 clutches in the last year...all because he gets it stuck in ENORMOUS mud holes, then hot dogs it to get it out. It's all because of the tremendous torque applied (from that 6) to wheels that are bound up...the only place left to slip is the clutch! I do know that this particular guy has the 10" clutch. I feel quite certain that he has used the cheapest one he can find.
With all that said, only you know what suits your needs and possibilities.