I'm sorry if you're grumbling, "Not another 4bt vs 6bt post!" but I would certainly appreciate any input. I've got a 3/4 ton Suburban with a 383 stroker. I'm planning to convert it into a home grown pop top expediton/overlander (whatever name you like) RV. I'd be doing little if any towing, want the vehicle to get me to the tip of South America and back and then to Alaska. Financially, does it make more sense to swap a 5.9, 3.9 or leave the 383? Thanks so much.