Vincent,
I think Rufus makes a lot of valid points. I just drove my 45 with a NA 2H for a distance of more than just around the block on Wednesday. I still have the 4.11's in place and it ran out very smoothly. I did not need first gear to pull away from a standing stop, even with a slope. The 5 speed with split T case in the HJ60 my drive train was salvaged from was designed to be used with 3.70 gears. Remember I'm on 31's.
Also I posted pictures of my air box on my thread for you. I didn't post pictures of the plumbing yet because I will be re-plumbing it tomorrow with some silicon 90's to get the hoses down away from the hood. I'll post those up when I'm done.
You really need to post up some pictures man. BTW since you are not too far away from me, when I get my 3.70's installed you are welcome to stop by and drive it to see what you think about the combo.