sounds like a bad combination for a pick up truck. Those closed chamber heads will up the compression over the 340 heads, which is exactly opposite of what you want.
This sounds like a terrible combination for a truck. Probably'll be not quite fast enough without being able to run pump gas or tow either.
Is your 10.5:1 with 62cc- heads or not? When you get near 11.5:1 you won't be running pump gas at all. The bottom line comes down to on a truck, you should really be shooting for running cheap gas. If it never sees it a day in its life it will be much better assurance for driving under a load than if you cannot/barely can run pump premium. The cam's probably a reasonable choice for the rest of the build in the motor. You should not be attached to compression in a truck. If you're that worried about power, I'd run a large port intake over the Performer even if it's cast iron.
Sounds like it's not 4x4- but the tall tires in the combo don't make going all the way to the solid seem like a good idea.