Will an Electric Water Pump Live on the Street?

A few years back I put a Moroso electric water pump and electric fan on my 340 Duster when I was taking it to the track more than driving it on the street. I did this to help cool the engine down faster between runs. This worked out very well.

Now I don't really go to the track much and want to start driving the car more often on the street. I'm not talking any highway jaunts due to the 4.86:1 gears, just local cruise nights and around town a little bit. My worry is that I may be asking more of the pump than what it was really designed for. The car will sit and idle forever and never move above 180', but once I start driving the car it creeps up in temp. I've let it get to about 210 before I pulled over and let the pump and fan cool it back down to where I felt comfortable.

I've read several posts about "is my car running to hot?" and a lot of people feel that 210 is just fine. The car has never over heated because I've never let it, but I'm just wondering if the electric pump is unable to keep up with the engines' cooling demands and if it would run cooler on the street if I put the mechanical pump back on it?

It has a 2 core aluminum 27"x18" radiator, 3000cfm electric puller fan w/ shroud, 180' stat, and a 21# cap. The radiator is completely sealed to the core support, so the air is not able to go around the radiator.

Could it be that the pump just doesn't move enough coolant when the engine is above idle?