I spent 5 more minutes today updating my radiator block.
The engine temp gauge did get fairly high during my 25 mile ride to work this morning.
I noticed that my radiator fan is off-center and it looked like vertical cuts would cool the radiator best
I went "Psycho" on the coroplast and popped it back in.
I will monitor my temp. gauge on the ride home and see how it compares to the ride out.
This morning, my heater definately did get hot faster, car warmed up much quicker!