I wanting to do an ls swap with my 4 wheel drive truck but the only kit I can find is a 2 wheel drive kit. Obviously I won't be able to make it 4 wheel drive but am I able to use this kit as it is or do I need to look for another one? I don't care if I lose 4 wheel drive

 

Simply put, no you can't use it.

 

The 4wd makes it a bit more complicated for the LS swap but it can be done.
The headers and engine mounts should be the same as the 2wd but the oil pan is very different due to the front differential. i only know of 1 company that makes an oil pan that will work for your swap and thats Milodon part number 31083. With that pan you will have to run a remote mount oil filter also.

I would recommend buying the headers and engine mounts from the same company to prevent fitment issues.
I used Current Performance for all of my LS swap parts in my blazer including having them build me a custom harness and programmed ECM.

Here is an example of a kit that might work for you. The headers say 82-95, But i have the ceramic coated versions installed on my 2002 2wd and they fit perfect.
Milodon 31083K: Street/Strip Oil Pan Swap Kit 1982-92 S10/LS-Series Includes: | JEGS