Grab an airbox & hoses from an NA 740. You'll need to reroute your AMM wiring, which shouldn't be terribly difficult. But now you might need to move the oil cooler... Or remove it, it's probably not hooked up anyhow unless you switched the oil filter adapter from the old engine to the new. And remove the intercooler so you can move the rad forward to make more room. There'll probably be a few other little snags, the key thing is to be in close proximity to a junked car from which you can scavenge parts.
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Chris, Dartmouth NS Canada 70 M-B 280SE, 83 245DL, 84 244 turbo, 90 780 turbo, 92 VW Golf, 90 740 Rex/Regina