cool truck...
own a 65 gmc longbed fleetside myself that suffers from major roof, hood, lower rockers, and floorboard rust. still has the orig 305E V6, 4spd on the floor.
your goals are definatley are way above anything im doing. going for the budget find anything that works rust rod theme myself, definately getting slammed with possibly c-notch and airbag...which will be the most expensive thing on the truck.
your best bet on finding a cab or hood is either finding a vintage junkyard (only a few in FL) or lucking out by finding a cheap donor or someone selling parts online. ive gotten a few parts from friends down in miami out of some of the junkyards down there...much better pickings than central fl.
honestly, your probably going to have to do some metal fab and welding.
i pass by a 66 C10 on a daily basis to work. ive offered to take it off the guys hands, but he refuses to sell.
heres my heap the day i brought it home: