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Maybe look at something like the ZT V8 70mm TB, have a simple adaptor plate made up.
If it's running DTA I've seen a KV6 with the VIS system de-activated and the flaps locked open, in fact I think Drew has the car now. It made very good low end torque even with all the stock inlet and it's flaps still in place, so with DTA you can map the torque curve.
I think with the increased flow from the inlet the the stock cams and valve train will be the limiting factor, to make the most of the new arrangement it would benefit from a compression hike and some nice cams.
What size exhaust manifold and secondaries are you going to run?
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