If your talking about using the driveshaft and rearend from the Camaro the Camaro would have to have had a TH400 trans for the tailshaft to work in your TH400 trans.Most likely it didnt but no big deal just pick a used TH400 slip yoke at your local salvage yard and put it on your driveshaft.Most likely the Camaro driveshaft wont be the correct length so you will have to have one made at a driveline shop.The slipyoke should cost you no more than $25 at a salvage yard and to get a driveshaft built and balanced with ujoints installed should run $100 +.