Good engines/engine combos that are got in 3/4 ton 4x4 trucks?

[FUNMUDDER]

Since no one replied in the 4x4 section, I guess I'll post this string of questions here.
What are some good engines/ engine combonations that are good in old 3/4 ton 4x4 chevy trucks? I would like to have a good deal of low-end grunt and a strong mid-range. I was thinking a 350 with a edelbrock carb and intake, some-sort of a truck camshaft, cast-iron vortec heads, and ram horn exhaust manifolds.

But then there is another side of me that says big-inch motors. Either a 455 poncho, buick or olds, or a 472-500 caddy. I would like to know what you guys are running for engines and suggestions for what to build up or what engine to swap. Money will is going to be kinda tight (I think, depends what I get for the buggy and what I have to pay the old man out of it) I was planning on running a automatic tranny, if that helps any. Thank you for the replies. I'd really appreciate them.
-Jake