A Saginaw pump will work better but it won't be the answer. With those tires hydro assist is the way to go. Check the frame over real good around the steering box there may be cracks, hydro assist will relieve most of the stress in that area.
By all means, now is the time to get that fuel tank out from behind you in the cab. That has to be the most dangerous tank set up in the history of vehicles. The Chevy's may blow up but at least they were outside. Find a junk yard tank that will fit inbetween the frame rails.
The plugin you are looking for is right behind the passengers side valve cover on the firewall comming out of the harness. You can just jump it across right there.
You have to take the heads completely apart to do any port work. I would also get new valve spring retainers & keepers. Isky Rev Lube is the best cam paste made.
You will be better off with your stock heads. With those dished pistons that are likely a lot more than .030 in the hole, you will just be chacing your tail around with detonation.
I'm thinking the next time mine goes bad I might try one of the later model gear reduction 460 starters. I have outboard headers so heat and fitment won't be a problem. Has anyone tried one ? If so how do you like it ?
Dennis, can you post a better picture of the organizer behind the seat ? I've never seen one of those. My truck had air horns way back but they were under the hood, If/when I run into the original owner I will ask him if they are original or if he put them in but as I remember they looked just...
There are 2 different designs I've come across, most are like the one you are holding. Make sure you don't have any play in the pinion, in, out, up, and down. Check your vent tube, make sure it isn't plugged up.
The only place that will pay any money for a 351m-400 in my area is the local scrap yard, and it's by the pound. There is no way a similar built 400 would run with a 460. Just look at the size of the 460 piston. The 400 may keep up with a lot of mods & $ but as it's trying twice as hard and...
You will need to check the new springs installed height. You may need to shim them. In extreme cases you might need to get the heads machined for spring seat cups to get them in at the right height.