Shaved heads and head gasket thickness.

If you're targeting maximum compression you only need about .035 piston to head, or around .075 thick if you're using the 1008 .039 thick gasket to check.
https://www.amazon.com/dp/B085MBM6V8/?tag=fabo03-20
https://sportcompactwarehouse.com/c...d-gasket-each?Year=1985&Make=Dodge&Model=D100