Cam help, and suspention Question's

I own a 3/4 74' chevy longbox, so far I have a 3" body lift 4" suspention lift. 36" superswamper boggers. I just built it about 2 months ago, and soon I hope I can get some pictures. My friends call it greaseball, because when I brought it home from a field where some guy had it parked for 7 years, it was covered in grease and oil, along with dog hair. through out that time I put a rebuild chevy 350, with a rv stage two cam, edelbrock aluminum vavle covers, stock chevy high boy performer aluminum intake manifold( which I plan on buying a edelbrock performer to replace)edelbrock 600 cfm carb, headers. Just recently dueled it off, with 2 1/2" exaust system to the back of the rear tires, with glass packets for now, have flowmaster's on the way! One concern is I'm looking at the 4x4 comp cam, I've looked in the jegs mags, and I'm looking at the second one from the biggest. What lob size I'll have to tell you later. I plan on putting timing gears, and a new oil pump when I put a cam in. does anyone have any sugestions on what size of a cam would work well with the setup I have? I would like to have a rough idle, that's why there second from the biggist looked the best for me, but I'm afraid if I go to big I wont have enough engine for it! Second question is I'll be putting a 6" lift kit under it, probly in the next week or so. My girlfriend has that setup on her 75 shortbed, and she brakes yokes on the rear diff, and universals in the front. so I'd like to change angle of the diff's without having to put shims in. My thought was to put a reverse spring shakle kit on the rear, but can I put longer arms on the front springs with out getting to much play in the front end, or am I going to run into more problems than that?

If I were you, I wouldnt put a big cam like that in the truck. Your not going to make any low end power. Big cams also need machined heads, different rockers, springs, and retainers. Also, if you buy one that has too much lift, your going to crash into your pistons and cause all sorts of problems. Its going to be some work if you choose to do this.

Thanks, I'm still in the learning process! I'm looking at this cam;

Xtreme 4x4 X4270H Hydraulic Flat Tappet Camshaft & Lifter Kit
Lift: .480''/.498''
Duration: 270°/278°
RPM Range: 1800-6000

However the next size down would be in my interest too!

Xtreme 4x4 X4262H Hydraulic Flat Tappet Camshaft & Lifter Kit
Lift: .462''/.480''
Duration: 262°/270°
RPM Range: 1300-5600

I don't want to go to big and defeat the purpose of what I'm trying to acomplish! and I don't want to deal with machanical problem that I don't relize! But I'm not sure if either of these two cams is proper. The other cams are located at; http://www.jegs.com/webapp/wcs/stores/servlet/product_10001_10002_746628_-1_10707
I also have a few photo's now hopefully the one I loaded will show!
Thanks
Jeremy

You should be alright with this one:

Xtreme 4x4 X4262H Hydraulic Flat Tappet Camshaft & Lifter Kit
Lift: .462''/.480''
Duration: 262°/270°
RPM Range: 1300-5600

The other one your going to need a higher stall converter.

If it was me I would go with either one of these, but they dont have the idle your looking for. Power curve matters more to me.

Xtreme 4x4 X4250H Hydraulic Flat Tappet Camshaft Only
Lift: .432''/.453''
Duration: 250°/258°
RPM Range: 600-4600

Xtreme 4x4 X4254H Hydraulic Flat Tappet Camshaft Only
Lift: .447''/.462''
Duration: 254°/262°
RPM Range: 1000-5200