In my bag marked "REAR ENGINE MOUNT BOLTS", I have four 7/16 coarse thread x 1-1/4" bolts with lock washers that go into the bell housing and two 7/16 x 1 fine thread bolts and nuts that go thru the crossmember. I believe your engine mount should be the same as my '51.

Kevin
1951 Chevy 3100 work truck
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1929 Ford pickup restored from the ground up. | 1929 Ford Special Coupe (First car)
Busting rust since the mid-60's
If you're smart enough to take it apart, you darn well better be smart enough to put it back together.