Heater doesn't work so good - 74 Duster

Is everyone satisfied with the heaters in their A-bodies?

I have 2 problems with mine.

1. hardly any air flow (fan on high)
2. Doesn't get very hot

I think the second can be solved with cardboard in front of the radiator (engine temp does not get very high)(yes, new thermostat), but before I start to diagnose the first, I'm wondering if anyone else has the same opinion.

Thanks