There are two ways you can go.
Bendtsen's makes an adapter kit:
http://www.transmissionadapters.com/early_olds.htm
There is an article on their website showing installation into a Pontiac.
Tanson's modifies your newer transmission case to bolt directly to the block:
http://www.forwhatyouneed.com/transm...conversion.htm
Don't know which is the better way to go.
Keep us posted on your progress.
Paul