I'm in the process of building an LS/VTEC turbo....why not just go that route? Go ahead and build your LS/VTEC. But build it for real. Sleeve it, bore it, pistons, rods, balance and polish your crank....ya know...build that mofo. Then down the road build a turbo for it. If you're going to do an LS/VTEC I highly recommend building it right off the bat. Do it right. What motor do you have right now? I assume just a stockish LS.