We normally saw about 5-7 HP increase from the same engine updraft vs. Horizontal draft, in the test cell. In addition, the 360 with the forward facing sump and 9:1 pistons pretty much put out 192-193 HP at full power with standard mag ignition and EI that held the timing to 25 BTDC for TO. I would assume, you would see similar gains on the 320 from the stock 160HP configuration.
Good Luck,
Mahlon
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