Early classic is a real good company.There a little expensive,but I always know the parts will fit the first time I buy them.Im planning to get thier 1pc window kit and electric window kits soon.
4/6" drop kit
http://www.earlyclassic.com/catalog....ry=Drop%20Kits
I would do a 383.They work good in trucks when you want some performance in a small block.I would start with the suspension,Then worry about getting the performance out of it.If you already have a running engine you should be good for now.
383 stroker kit
http://shop.enginekits.com/osb/itemdetails.cfm?ID=81