The GSR head will actually produce more HP than the B16A head. Go with the GSR head and intake manifold. If you have the cash opt for the Skunk2 manifold. You can't just slap the VTEC head on the LS block. You have to plug up the oil lines in the head the tap a oil feed line in the block. You can buy the oil plumbing kits at like JDMhondaparts.com. You also have to make sure the GSR head comes w/ the distributor and VTEC solenoid or you'll have to get one. You'll also need a DOHC VTEC ECU or run the extra lines for VTEC and get a VTEC Controller like a Fields or an Apexi. A GSR tranny will also help you to reach the VTEC point a little faster and better.

If you really want the setup to work you need to have you crankshaft balanced, and get some better pistons such as Integra Type R, or aftermarket higher compression pistons. Plus new piston rings and bearing. But once your done you'll have a N/A tuned killer on your hands. All this would produce like 180hp to 210hp at the wheels.