if it's a 307 olds engine, the bellhousing will be the same. BOP stuff is the same. Altho a 200r4 in a 77 probably isn't org? don't know about the 307. Anyway, about those brackets...save your self some time, money, and major headaches...get the bracket assembly from a 301, and the crank and water pump pulleys, and you're set.
as long as you use 68(i think) and up heads, you'll have all the bolt holes you need, and that way you don't need to waste time finding brackets that might line up.
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