Did you mean P1Y1's of 763 Kokutai which were at Clark/Nichols area Nov - Dec 1944? Also 762 ku were operational in Philippines with P1Y Frances. I found that 753 kokutai was a G4M Betty unit.
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There may have been a recognition problem as the Hellcats of VF-15 may have misidentified a J1N1-S Irving for a P1Y1 Frances. Irvings from 153 Kokutai were in the Clark/Nichols area at that time.
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Wouldn't it be more likely for a fighter to be taking off? Or was it a bomber by coincidence?
Darryl