As far as getting a new head, if yours isnt cracked and you are doing a valve job just keep the one you have. They are getting pretty scarce
Just have a valve job done and have hardened seats installed
Having one that has been machined before can be a good thing and it can actually provide better performance.
A 2.0 head can easily be machined .040 and will provide better compression, about 9.0:1 vs the original 8.1:1
Every .040 inch machining will raise compression about 1 point
The 1971 pintos had 9:1 compreszion and made 100 hp in 72 and 73 they reduced the compression to 8.1:1 and the horsepower dropped to 87.
I cut mine .040 and can still run 87 octane with no problems
BUT as in previous posts machining the head will affect the length of the cam to crankshaft pulleys and make it difficult to get the camshaft timing correct
An adjustable cam pulley is about $120 and a really good investment to optomize the cam timing.
https://www.burtonpower.com/kent-cams-adjustable-steel-cam-pulley-ford-sohc-pinto-ft310a.htmlRacer Walsh can get it for you
Also again consider a pertronix ign module about $125
https://www.amazon.com/PerTronix-91847A-Adaptive-Aftermarket-Distributor/dp/B000N2U5TGPinto uses a bosch distributor similar tk the volkswagon
They fit into the distributor and replace the ign points