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Chris, if you ever get the chance to compare a 1g and 2g head, you'll see a night and day difference as the ports are much larger and it'd take a lot of time to get a 2g head to that same point. Many will say that the 1g head is good for up to 500hp in stock form. Whether that's true I cannot say for sure. As for the valve train I think they are about the same between the two.
If you decide to upgrade the valvetrain, oversized exhaust valves are a good idea to help get more exhaust out with every stroke. If you plan on having it be a higher rev motor you'd probably wan't to consider new springs and retainers and especially if you're doing valves you're that far anyway. Having a strong head is one of the most important aspects in my opinion as to acheiving high hp goals.
About the clutch, I think the 2600 is great. After driving commercial trucks all day long, the 2600 doesn't feel all that tough as so many people talk them up to being. I don't know anything about the 2900 except JET planned on running one until he found out about his motor.
Most of this is just my opinion, so take it or leave it as you wish, but maybe it'll help.
-Steve
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