Saga,
I'm having problems following your cause and cure.....
- You have lifters in the engine that have 300 miles on them.
- You think you have a wiped cam lobe.
- You think you're going to need new push rods, rockers and springs.
- You mention that the engine is 30 years old.
I'm assuming that the engine parts are all 30 years old, but with lifters that have been replaced 300 miles ago. Why was this done?
Checking the lift at each lifter with a dial indicator will tell you right away if you have wiped a lobe.
New lifters on an old cam, could be the start of a down hill fall to engine failure, and if you wiped a lobe, that metal is now part of the
oil circulating around the bearing surfaces of the whole engine, and will slowly grind them away.
From where I'm sitting, you're throwing your money away by trying to fix an ailing engine by just putting in a new cam. And you never replace a cam without replacing the lifters. Given that the engine is 30 years old, has metal circulating around in it, and your limited budget is preventing you from "doing it the right way", my advice would be to spend your money on a good junk yard motor or a rebuilt one from a reliable source. At your young age, and with the limited experience you have with engines, this may be the most cost effictive way to get your ride back on the road.