tranny is not a 200r4 but probably a 200c
just look on the driver side of the block in the back on the side you will see a casting # on the side of the block what everybody hoping is that it should end with #109 IT SHOULD BE 109 IF IT IS THE ORIGINAL ENGINE!
this will save you the trouble of counting oil pan bolts.
also i have a 1985 block that ends with 140 that is a 20 bolt???