I looked at both the early and later transmissions and pans. The notch in the pan is for clearance to one of the bolts for the park cable housing. With the later pan the bolt head is covered, and unable to be removed without removing the pan. Not a real problem as it is rare to need to remove that housing.

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Charrlie_S
65 Valiant 100 2dr post 170 turbo
66 Valiant Signet 170 nitrous
64 Valiant Signet
64 Valiant 4dr 170
64 Valiant 4dr 225

Thanks and it has been a 4 year project

Geeze, that is a honey of a car; the whitewall tires look great on it!

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一期一会
Too many people who were born on third base actually believe they've hit a triple.