how to install headers?

By far the best thing to do to install the drivers side header is to remove the steering column. To get it out everything is accessable and will only take 20-30 minutes but will reduce the frustration factor 10 fold, you won't even need to jack the engine out of the mounts. Also, it you have power steering un bolt the box from the k-member but leave in place. Once you have this done you can slide the header up into place from below. Bungie it to the block until you have the steering box bolted back into place.

Another thing to use the reduces the frustration factor is to get header bolts with a reduced size head. The ones I used have a 3/8" hex. Most of the bolts you can access with a 1/4" drive 3/8" socket, the rest with a 3/8" combination wrench.

When I put the 360 in my Barracuda I used the gaskets that came with the headers, these were leaking in less than a week, Mr. Gasket lasted about a month. I tried copper but they wouldn't seal at all. I then went with two Fel Pro header gaskets per side with a coating of high temp silicone seal on them. That was 45,000 miles ago and no leaks.