In addition to the work required to fit a VTEC head onto your LS block, I'd upgrade the bottom end.

Specifically, I'd replace the factory rod bolts with ARP bolts, upgrade to the GSR oil pump and install the GSR's crankshaft main bearing girdle. All of these modifications will help maintain reliabilty at high-rpm use.

What will you use to manage the engine. You'll need a VTEC ECU to control the VTEC head, but if you're using an add-on computers to manage the supercharger and fuel enrichment, it may be easier to upgrade to programmable ECU (like AEM's EMS series, for example).

In terms of rough setup, I'd switch to the VTEC cams at around 4500K and to be super-conservative about engine longevity, I'd limit myself to about 7800 rpm, despite the rod bolt upgrade and bottom end reinforcements.

My 2.3¥