MRL 360 Coolant Temp 210+

Does not sound like there is any one huge problem, but that radiator sure isn't working very well.
You don't need an aluminum radiator. Brass actually transfers heat better. A good brass 3 or 4 row radiator is what you need, unless weight is big issue.
Sounds like the fan might be a little close. 1/3 inside the shroud is what you really want.
You could probably advance the timing to 35°-36° total. Retarded timing will often make them run hotter.