Best site on the 'net for '67 info: www.earlycj5.com
33x10.50 are the perfect tire for that early CJ, but you only need a 2.5" lift to run them effectively. You'll have to run a 10" wheel and fender flares if you go to the 12.50 tire.
Chevy V8 will fit, but you'll need to run a late CJ grille, and even then it's a tight squeeze, partly due to the distributor location. Remember that the fenders in that JEEP are 3.5" shorter than the AMC V8 Jeeps.
Look into Holley Truck Avenger instead of that Edelbrock 600cfm. I've had a terrible time offroad with that Edelbrock carb in the past. The Thunder series offers some promises of improvement offroad, but I've not yet heard any first hand reports. I'm extremely pleased with the TA; "poor man's EFI."
Buick V6 is an excellent alternative to the SBC. Chevy 4.3EFI are also popular as you can grab a wrecked S-10 for next to nothing and have parts on hand to do several upgrade conversions at once, including Saginaw steering and vacuum powered brakes, which you're definitely going to want to do if you intend to run it on the street on a regular basis.
You'll also want to invest in a Warn overdrive.
Go with BFG M/T if you want to run on the street; I've known folks with those Thornbirds to get no more than 20k miles out of them on pavement. I think they were also voted by JP magazine staff at one time to be the worst offroad tire currently produced.
In addition to earlycj5.com, also check out my '70 build thread linked in my sig line. I installed a T-18 instead of SM465 and Buick V6 instead of SBC, but basically ended up with a similar trail/driver JEEP to what you are describing.