I did a ton of tune up work on the truck this past weekend. The biggest thing is a new carb. I went with a Quickfuel Slayer 600 cfm. I also put in a new thermostat (it overheated right in downtown Portland), new fuel filter, and new air cleaner. I also installed an in-line fuel pressure gauge and put in new plugs. I had to bend my throttle rod in weird ways to get it to the length I needed. I have a new one at the correct length that just arrived today.
Holy Crap! It's a like a new engine. Pulls so much harder now its unbelievable. I thought the engine was just a dog and headed for a rebuild, but man, what a difference.
Also found out I have late model camel humps. Casting number 3927186. From what I have read they are the later heads with accessory holes. Cool. I know these have been beaten by any modern head, but its still pretty cool, set up as an old school hot rod.