i am building a built 408 and want to use a chevy powerglide i have laying around. i was wondering if anyone has done it and what i need to get to do this combo and if it is possible????

 

Depends on the route you want to go. The more expensive way is to have the bellhousing milled off a powerglide and get a bellhousing from someplace like JW or Reid. Like this
http://www.reidracing.biz/images/BH010-big.jpg
They also make cases that are designed for their bellhousings.. pricey

Or you can get an adapter plate like this
http://www.jegs.com/images/photos/80...890-529600.jpg