It looks like a 4 bolt drive by wire LS throttle body. You would be better off having a hydraulic or hose shop modify you lines to make them work with that plenum. The throttle body could be replaced with a cable throttle 4 bolt LS throttle body, though those are all aftermarket and pricey. You could also get a 4 bolt to 3 bolt adapter and use a stock LS1 throttle body, which can be had at a junkyard or off EBay for cheap. The tune should work reasonably well with the same flow rate injectors, though the airflow differences really will need a tune to make the most of. You can use a C5 Corvette fuel filter for your returnless rails, as that filter has an FPR built in to it along with a return line. You'll have to fabricate the line from the filter to the rail, and modify your return line to connect to the filter, but it would work. Option 2 is a stand alone FPR which you can plumb into your existing fuel lines in the engine compartment.
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