I know for sure you will need another trans, Chevy transmissions are a different bellhousing bolt pattern than Buick,Olds and Pontiacs. You will also need Chevy motor mounts,accessory brackets(power steering, A/C,alt. etc.) Most likely will need a little exhaust work too. Not sure what style tranny you have now (t-400, PG, etc., as long as you get the exact same style tranny for a Chevy your driveshaft and rearend will work just fine. It's not a huge job going to a BB Chevy but it's not just a drop in project. Hope this helps you out.