Broken Valve Spring - Which New One?

In a perfect situation ie. last winter, that's exactly what we would have done or even replace the cam and springs with a matched set. Right now, we are thrashing trying to get the car back on the road.

Can we pull a good spring and measure it, then buy one the same size but maybe upgrade the pressure just in case they were too small in the first place? I have a set of brand new Edelbrock springs that came off of my aluminum heads?