85 Riviera transmission question

Does anyone know if the bolt pattern for the 85 Riviera transmission with a 307 Olds is the same bolt pattern as a Buick Engine of similiar years?

Welcome to AF. Yes for front wheel drive. Of course the Riv was the only one with the 307 except for the Olds Toro, also the same. If I remember correctly there be an adapter to the block involved.