me & my 70:

intake: thin black fiber gasket material, permatex 1a both sides. cereal or saltines cardboard also works great.

head: original gasket, nothing else.

cylinder base: permatex high-temp RTV only.

exhaust: original gasket, permatex 1a both sides.

after discovering the flaws in the flanges, i used a flat file on them, my intake & exhaust have never leaked since.