Hi Dan,
The standard pump is perfectly adequate to pump up to a front matrix.
Go for a pump with a cast iron impellor. The pressed steel impellor dosen't pump as efficently.
Try to incorperate a bleed screw or something like it near the heater matrix to aid bleeding air out. I used a motorbike radiator and cooling fan. The radiator had a radiator cap on it which just needed to be cracked open slightly to expell any air.
This set-up keeps the engine cooler even with out the fan running, and keeps toes warm when it is running
Jerry