There is still an overflow issue I believe, as the engine does heat up if I sit still too long. I can't remember how high it gets, if it reached 200 or not, and it's hard to test now that winter is here
It is normal for fluid to expand as it heats up.
If the rad is 100% full some fluid will move from the rad to the overflow.
(And back again when it cools)
If you are not using an overflow and you don't have the 1 inch air gap in the top rad tank, than fluid will escape out till enough has been removed to create the air gap.
After that you should not have any overflow issues.
ASSUMING all other things in the cooling system are working properly.
On my stock 67 Dart 273 2bbl I keep a 1 inch air gap and have not had a drop come out in 7 years, not even when bracket racing this and last year.
My car routinely gets above 200 when sitting in traffic etc.
