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Again, it's your car - Do what you want with your car -
but I agree with thom. silver is a very desirable color, and 73 2.0 is very desirable. it will hurt your resale value... some.
but a quality paint job is more important than the shade, imo. if the paint was original, and not a respray already, I would highly suggest trying to match... good paint shops can match paint very closely. but since this car is already a respray... and if a color change is what you want...
if it were me tho, I'd get a second opinion and match the paint. I can't see repainting the whole car just because some guy is too lazy to get the mix right to match