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Should be a 727. Not many 904s in '64 (I think that was the first year for them - or was it '65?). My poly has a 727. I mentioned the big block in case you were thinking of swapping the engine down the road.
I'll try a link that shows a diagram of the difference in shapes. Looking at your pan will tell you which one you have.
Thanks 64bel, I just want to be able to drive the car for now. I need to know what to ask for when I am at the parts store.
Trans is leaking pretty bad on the pan gasket
For the future the 904 pan was somewhat square. The pan on the 727's had a small outcrop on one corner making it not perfectly square. Ma did make BB and SB 727. The bolt patterns are different.
Small Block