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There really ought to be a sticky thread about this sort of thing... this is a very common question.
Unless it's a special precision cap in a piece of test equipment or something, go with the closest modern value. Simple as that. A 30uf cap would be replaced with a 33uf, 50 goes to 47uf, 0.05 goes to 0.047, etc.
Old caps were usually marked with rounded values, while newer ones switched to using the same standard of values as resistors, I guess for uniformity. But it's really just a difference in the naming rather than a difference in the caps themselves... the marked value is simply a nominal one, there's also a tolerance to account for. For example, an average 47uf electrolytic cap with a +/- 20% tolerance could actually have a capacitance anywhere from about 38uf to 56uf. (Though in my experience they're more often on the higher side of the range than the lower.) And the tolerances on old caps was usually much looser than on modern ones, so an old 50uf cap could have an even wider spread.
As far as the F&T caps, they look to be some sort of 'boutique' capacitors aimed at the guitar crowd. I imagine they'd work just fine, but any of the supposed benefits of them would be completely lost on a cheapy AA5 radio anyway... you'd be much better off saving your money and just getting Nichicons, Chemicons or Panasonics from Mouser.
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