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@edscoble
well, they're clincher since the 'not clincher' one are tubular, of which the tyres are tubular (inner tube already in it) glued onto the rims, the clincher are named because the tyres 'hook' onto both side of the rims.
older rims are sometime not as strong as modern rims, and rims do have a limit on how high you can go, e.g. Mavic Open Pro recommend not to pump the tyres anymore than 140psi with a 23c tyres.
the disadvantage of your rims is that (if it is indeed correct) you can't exactly use those modern skinny tyres like a 23c (depending on which one, some are fine at 100psi).
The best thing you can do is get thicker tyres (the thicker the tyres, the less psi.), says, a 28c which sometime require only 85psi, especially touring tyres.