Which transmission.

904 pan is almost square and the 727 has a kick out on the side.
You probably have a 904 in that car.
In any case, do yourself a favor and get the gasket for the 42RH.
It is rubber over metal and is reusable.

If for some reason you have a 727, the 46RH gasket is the one you want.

Sealing a pan gasket can be a bit tricky if you are not familiar with doing it, and the reusable gaskets work really well.

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Thanks! I'm was planning on using either Dextron Vl or ATF4+4. I'm only replacing the amount that comes out of the pan when it's dropped. Would Dextron Vl be better? Thanks.