The VTEC has a different cam and head. It also has a VTEC solenoid. I am not sure if you can run a VTEC engine without a VTEC computer. If you get the computer, the wiring harness is different. I think it's only the VTEC wire. I was looking into what it would take to swap mine over to an HX.
Did you check
Car-Part.com--Used Auto Parts Market for a non-VTEC engine?