Unless you want big power James, you don't need a built block IMO. Don't waste your money.
If you don't want a lumpy idle, I'd go for a set of 264 cams. The plenum is not nessessary but a nice feature. The Wangan Supra was running over 800hp in Japan with a stock intake manifold and throttle body.
If it were me, I'd have a Syvecs fitted first, as it has an awesome traction control and safety features, then upgrade your cams and intake if you wish at a later date. That's if you don't want to she'll out all the cash at once and do it all together.