well if you want to do and LS vtec swap, that means your using an integra LS motor, the b18b. Ls vtec would set you up nicly for boost. CRVvtec set ups are not all that impressive, and your likly to pay more finding a b20 block due to it not being as common. Selling the b16 block could be tricky, but you best bet will be to post it on ebay, and turbo forums like homemadeturbo.com, as a block will appeal to those looking to build one up.