Straight 6 is a bad idea. THe 510 has a short engine bay, striaght sixes are long. You would have to cut the firewall apart the engine would pretrude in the cabin and the tranny tunnel would have to be resculpted.
V6's are easy, turbo/twin turbo V6's are hard. Lots of plumbing, no room to do it. The turbo route usually requires converting the car to rack and pinion steering, which is difficult and not well documented.
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