Jegs or Summit produces an adapter plate to mate an Olds engine with a Chevy transmission. Here is the link.
Adapter Kind of pricey in my opinion, but it is an option. You may want that OD transmission (if it is any good) for the fuel economy on the highway.
I know that on the Olds site I belong to, some people have made their own BOP-Chevy adapters. this would be a cheaper route and you have the engine and the transmission to use for templates.