VX -- Del Sol engine swap

[GasSavers_moses]

Newbie questions--

I was thinking of a Civic VX for gas mileage but the car is so plain-jane (although pretty) and I only need a two-seater. Since VX engines seem to be pretty available I was thinking about dropping one into a del Sol, which I really like, if I can find one with a blown-out or high mileage engine.

I've seen a lot of Honda expertise on this site and wanted to ask about the potential for making an engine swap. I've done lots of work on cars and motorcycles but have never swapped an engine (and will be paying someone to do this one) and have never owned a Honda automobile so I thought I would ask some experts.

I understand that mechanically the D15Z1 engine drops straight in to all the del Sol models but I'm not sure about other stuff.

1. Do I need to replace the entire ECU or can I replace just the chip(s)?
2. Can I go with a non-VTEC del Sol S and keep its wiring harness but run the VTEC wires separately, assuming I can break into the harness connectors?
3. What else is going to bite me in the ?

thanks from the new guy,