adjust the valves they are solid lifters . after a while the exhaust valve sink and cause them to tighten the lash up. The exhaust valves are probably tight. If they are it will pop out of the exhaust at an idle. Valves on the loose side are better then tight. Big power gain,
Rust, Put POR15 paste on the rust hole let it harden and then plug the cowl drains. Mix a gallon of POR15 with reducer to get more quantity and pore the cowl full. Jack the car on one side as high as you can and then the other to spread it. Then drain the cowl. Remove the carpet incase you have more then one hole. If you do have another hole putty it and refill the cowl. easiest and most effective way that I could think of. Removing the cowl is a major job . windshield , fenders , hood lay the dash back and a bunch of spot weld drilling
I did them in the past . never again. When they are rusted that bad I strip the car for parts. Getting to old for all that work.
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