OK at home now on puter.
85 302 will be a 50 oz imbalance. You will need a flexplate to match the bellhousing size on the C4, which if the trans is a 64 model, should be a small bell. The small bell takes a 157 tooth flexplate, but Ford never made a 157 t in the 50 oz size, but the aftermarket does.
Next thing, if the trans is indeed a 1964, it will have a 5 bolt bell on it. You will need a 66 or later 6 bolt bell. Now here is where things get tricky---there are two different design c4's, thus two different design bells, as well as two different sizes! A case fill, meaning the dipstick goes into the case, takes a bell that bolts to the front pump. If yours is indeed an 64 model, it will be case fill. Just make sure you get a matching bell and 50 oz flexplate and block spacer and you're good to go.
To thoroughly confuse you, on the pan fill transmissions, the dipstick goes into the pan, not the aluminum case. Those bells bolt on with a set of bolts outside of the pump bolts. Don't get them confused, the bells don't interchange.
That should get you hooked up. Any more questions, just ask.