1970 chevelle driveshaft for T-400

hello
im looking for some advice before doing anything
i have a 70 chevelle ( without drive shaft )
im going to get an old complet 1973 chevy truck with a 454 and th400 ,and swap the engine in the chevelle and keep the original rear end 10 bolt



my concerne is the drive shaft
i dont want to spend amount off money for a driveshaft
do you have any suggestion ?

thanks