I am getting a 396 from a friend to put in my pick up and i was wondering if anyone knew of a site or catalog or someplace that sells whole engine rebuild kits

Two places come to the top of my mind.

http://www.summitracing.com/
http://www.jegs.com/

For stock rebuilds most parts stores like Auto Zone will let you order parts for delivery some also offer hop ups as well. Good Luck.

Try Northern Auto Parts. 1-800-831-0884 or northernautoparts.com . 396 w/ 4-3/32 bore, $460. They have kits for just about everything imaginable. Make sure you order the kit w/ moly top rings because the set that typically comes with them don't last. The rest of the kit should hold up pretty well if you don't beat the bejesus out of it every day.

Good Luck!