Matching engine paint is like beating your head against a wall. Whatever you do, do it to both heads.
Point taken
... Although... hardly any of the vertical head is visible anyway....
I used to paint the entire motor.
I have neither your skills nor equipment... so when I ask "what with?" ... what I really mean is.... can I expect any kind of an acceptable result out of a rattle can?
So, what is wrong with two tone?
It's already three tone Howie. Cylinder barrels are black, heads are a light grey/silver and the outer engine cases are a darker almost gunmetal colour...