[Toivo]

it may be overkill, but you can install two pumps in series.
one pump basically acts as a primer for the second pump and eases the strain on it.

The most important thing to do if you're worried about your pump is make sure it gets pure, clean fuel. Crud is what destroys these pumps faster than anything else. Make sure your filters are the best, AND installed correctly...no gaps or seating problems.

You could also plumb up a dual-pump system to kick in when you hit the NOS button, assuming you have NOS, or even if you don't. With the proper fittings under the hood, in a pinch you could reroute the second pump's output.

Do you pack a spare for every part on your car, or just things like fuel pumps, alternators, U-Joints, clutches, the odd belt, assorted nuts and bolts...

Holley sells parts to fix its pumps because they do break, heat also kills pumps. Have you considered an OEM-type pump, maybe mounted in the tank, cooled by the fuel, easy to get to, easy to find a replacement for? By the time you go through multiple Holley pumps, you might be money ahead.