I run 2800 rpm one, and it helps with the 2.73 rear gear set up I believe. The more Torque, the better high gears work IMO. So while it sounds like a weird set up, it works well in spite of out of the norm. But I don't think it would work as well with a 400 vs 455 I have. To answer your question I would probably bump the stall up from stock a bit. 2200 / 2400 (?).......... I defer to the experts however......
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72 Bird
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