Well the vacuum and PCV hoses are easy to check yourself, just look around at all the hoses attached to or nearby the intake manifold and valve covers (2x PCV-related lines on each side, and brake booster vacuum in the rear. Check out the MAP sensor too, it should be plugged into a short hose on a T-adapter in the rear as well in an M370 config I think).
The worst will be what SS Firehawk mentions above: it could be the gasket between the M370 and the lower intake manifold moved at the last second during the install and got pinched and isn't sealing. It sits in a groove on the underside of the M370 and presses against a flat surface on the lower intake. No way to see it while installed, but it can easily fall out of the groove as it's hanging upside down just before they're pressed together. The seal should be lubed for install anyways though, and the lube should help hold it in the groove for a few seconds.
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