1959 Apache 4x4

[ord27]

looking for some input
My latest project is a 1959 Apache 4x4 that sits on a 1979 c-10 frame
It currently sits to high, but I plan on maintaining a good 4x4 stance (no lower rider).
I plan on using the truck a s a driver. I would also like it to be able to handle a bed camper, and pull a wake/surf boat. If the wife is going to tag along, I need it to ride smoothly and be comfortable.

so I'm thinking:
modern interior
air ride suspension

what's the smoothest? 4 link?

my question is really about engine and transmission.
I'm thinking big block fuel injected. Maybe a 502.
perhaps a tremec automatic and a more modern transfer case.

anyone have any thoughts or engine recommendations? It needs to have hauling power, but somewhat good on fuel.
I plan on lots of in town driving, so I am steering clear of diesel

thanks

[DBasher]

For all of your suspension needs I'd be calling these folks, they know these trucks and how to get them riding right.

http://offroaddesign.com/catalog/ORDCustomSprings.htm

Cool truck

[Payton King]

I would put a duramax in it.

[DBasher]

That would require stretching the front end....

[jy211]

transplant a LS engine combo

[ord27]

I was thinking Duramax. I'm not sure what that would take.
can I use the same frame?
What frame would work with the '59 body?

I've searched for a complete turn keyset up, with no luck