[Blown353]

Just my opinion here on how to proceed spending your money: the engine will make way more power with *less* boost if you buy good heads and use a simple single plane EFI intake compared to running the stock heads and an expensive sheetmetal intake.

You'll probably come out the same either route in the money department, I strongly suggest you spend the money on the heads and just run a cheaper but still good EFI single plane-- it will make more power everywhere! The out of the box ZZ502 heads simply aren't very good pieces, the exhaust ports are the real choker on them. You can easily change the intake later. Do the heads first! A single plane can still look pretty trick if you run an elbow on top with a monoblade throttlebody. A monoblade is the preferred setup for a boosted application, the throttle response is noticeably improved compared to a 4-barrel style throttle body.

You can probably get away with a 12-rib belt if you run a GOOD tensioner (i.e. not the one Procharger provides.)

As far as headgaskets, MLS gaskets such as Cometics are an excellent option and are the only way to go on most engines, boosted or not-- but only if the block and head flatness and surface finishes meet the criteria for them to seal up properly. A good shop can easily provide these finishes if they know what they are doing and their surfacing equipment & cutters are in good shape.