v8 swaps can be found in the Epic Tech forum.
as to the 3.4, it's a good engine if you're on a budget. It'll reuse most everything you've got attached to the current block (you'll need a balanced flywheel and inline fuel pump). or, for maximum improvement, you can swap in the entire camaro 3.4 including accessories and fuel injection. the FI harness is stand alone and I'm told pretty easy to deal with.
in the end though, it's no v8, so if you've expecting tire shredding, neck snapping acceleration, a 6 cylinder won't necessarily do that.