New tractor owner with a few problems...

[bajabum]

For a while, after leaded was being phased out, car makers started putting in hardened valves and valve seats.
About then, (70's) the high compression v8's were being phased out, in favor of smaller engined cars, with lower compression.
Then came MTBE, which is yet another horror story
Your Ford 3000 has lower compression than the cars of that period, and will run just fine on modern regular gas.

Note, Modern regular gas will turn to muck, and clog the heck out of your fuel system, unless you use alcohol free gas.

 

[Soundguy]

all fords left the factor with hardened exhaust valve seats.. all fords except the wartime 2n, left the factor with hardened intake valve seats.

Tetra ethyl lead was predominantly an OCTANE booster..

 

[Soundguy]

there is a additive you can buy that will put the lead back into the fuel. Talk to a speed and custom parts dealer. OR to someone that has an antique/post war classic car.

snake oil.... tetra ethyl lead was a good octane modifier. interestingly enough. so is ethanol. for a short time anyway.

fords have hardened exhaust valve seats.