Is that the sr20ve one in your sig?, if so pics of bay please :). Looks neat with the flares, always wanted to see a sedan with flare's, although I'd never do it to my red one, my parts car I was thinking to paint it camo with flares tho :), I think it will either end up being sold with my a12 once I do the l20b conversion or kept as a track car.
do you have flares?, if you don't they will not fit under the guards, with no offset listed they could be right out the guards, or rubbing your struts/leafs.
Yes, but keep in mind your block height will be higher, so any cooler piping will have to have some leeway for that.
If you are making it straight to the carb without a cooler, it should be fine, providing the manifold you have will line up on the other head, i.e later bolt pattern. This is easily identified by each set of 2 ports having either 1 or 2 bolts.