I'd actually recommend the Helms manual. They tend to be a LOT better on Honda books than Haynes or (the worst) Chiltons. I would also suggest visiting crx.honda-perf.org - a lot of those guys have Integra motors in their CRXs and can probably tell you as much about them as the designers could.
As for N/A vs turbo, well, that's kinda up to you. Turbo is cheap power, but you have to tweak it, and you have to make sure your cooling system can handle the loss in efficiency due to an intercooler being stuck in front of the radiator. You also have to either know what you're doing or find someone who does or you can find yourself in a lot of trouble very quickly. If you decide to go with boost, I'd probably build the engine up while I was rebuilding it so it could take more than 9lbs, which is about as much as you'd want to put on a B18 with stock internals.
You have another option here as well - an LSVTEC build. Basically you take a B18 (integra) block and mate it to a B16 (del sol vtec, civic Si) head. Locash Racing has been doing this for years, and it's a very common engine now. (You can then put the B18 head on the B16 block and sell it to help finance this).
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