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Well I have 87 Grand Prix I wanna do a ls swap on and I have a donor 06 impala ss but it's front wheel drive and has a different pulley system. Can I use this engine for my swap and if so what do I need to change to make it work?
take a look at the LS4 starter and bellhousing pattern, that will be a bigger issue.
And the LS4 has a shorter crank that wont work with other accessory drives.
You have a G-body, a very common swap candidate. There are plenty of g-body builds to learn from on the forum.
Agree with others, the LS4 is an oddball front drive engine, don't bother trying to make it work.
It's possible, I put one in my MGB. It will require some fabrication though. You can look at how I approached adapting a RWD starter here.
I've had it on the road since this past spring and am very happy with the result. If you want to read about how I stuffed it into my B you can look here.
It's going to be more work than starting with a RWD motor but can be done. Hope this helps.
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Need help 5.3 ls4 ? 
