I'm guessing you found the JTR kit, the scarab/hooker kit, and the JCI kit?
JCI is for the gen 3/4 engines, so it won't work with the gen 1/2 small blocks.
The JTR kit is the standard. It's a quality kit, and it's reasonably priced. It sets the engine low and far back, but it really limits your header options. You are looking at custom if you want long tubes, but if you stick with block huggers or manifolds, then there are a TON of options out there.
The scarab kit places the engine further up and away from the firewall, but the headers that hooker used to make bolt right in.
I haven't done the swap personally, but if I was doing it I would buy the kit from JTR and get their swap book too. There is a TON of good info in there!
If you use the search function, you'll be able to find the nuances of each different kit, but this should get you going in the right direction.
Hope this helps,
Ryan