Read Paul’s comment and picture how that wrong piston is operating relative to the other 7. It is pushing down on the crank crank at top dead center a couple degrees different than the other 7 pistons. That is throwing off the balance of the engine some because the mass of the piston has a different dwell at top dead center than the other 7. There would be no way I can think of that any engine could be balanced properly like that.
In addition to the balance, running the piston offset backwards from stock, it also changes the timing the engine wants also by a few degrees. I want to say it takes less timing by a couple degrees.
It can (and did) run like that, but it is certainly not right.
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