Denise, if you have a couple of guys who have done them, I can't see why they can't remember, was there alcohol involved?
Listen, most of it is common sense. But there where a few things that REALLY helped me a lot that I picked up. First off all to set the thing at the right ride height you can put some "all tread" in place of the shocks. Then tighten the nuts down on the rod to compress the springs down to a ride height it will have with the weight on it. Do this by measuring the distance between the rubber bumper on the control arm and the frame on a stock Camaro/Firebird. They weigh about the same 3500 lbs as your truck. So after you have the frame clip down at the riding height you can then set your truck up on jack stands at the height you want it when done. Now, when you roll up the sub frame (with the wheels you plan on using) to your frame (cut off a little after the firewall, THAT is something your guys are going to just have to figure out) you can weld it on and the truck will sit at the proper height and you won't get any surprises when you finish the truck up and put it together.
Now, the next BIG thing. This is a BIGGIE that is missed by many people. You need to use an angle finder on the upper control arm shaft to find the angle it is on the STOCK Camaro/Firebird. After you have recorded this angle you HAVE to put your sub frame in with the control arms at that SAME angle. Now, the truck will have to be set up as I said at the ride height it is going to be when you weld the sub frame in using that upper control arm shaft angle. This will ensure you can align the thing when you get done. Fitting it to the frame "pretty" is NOT the most important thing, it is making it work right. GM spent a lot of money developing that front end, in fact it is one of the best ever for handling. So you need to use it EXACTLY as they did, that is why it is so important to set the control arm shafts at the correct angle.
Last, just tack the sub frame on and then install the sheet metal. Sand back and look at it, look at if the wheels are centered nice in the wheel wells. This is more important than the measuring tape! You can measure and cut all you want putting the wheel base back where it was, but NOTHING is more important than this step. If you were to have it off, make the wheels too far forward, too far back, and it will look like POOP.
All of the rest is pretty basic, if you need any more info don't hesitate to post!
