Are classic parts reliable enough for regular use?

http://cgi.ebay.co.uk/VINTAGE-RACING-CYCLE-Frame-Fork-Mercian-Strada-Speciale_W0QQitemZ180490218781QQcmdZViewItemQQptZUK_sportsleisure_cycling_bikeparts_SR?hash=item2a060e2d1d#ht_1824wt_911

Helpful thread - apologies for a slight hijack, but having just become the owner of the above, I was intending to convert this to fgss so as to reduce daily wear & tear and change the wheels to some deep v's/phils on clinchers (mainly because the above has tubs) and not sure how robust those GP4's would be. An alternative would be to rebuild the wheels with open pros and run it geared, using it pretty much as it stands....any additional thoughts?

GP4s are very tough - a step down from SSC rims (which were the most heavy duty of Mavics rims, used in the Paris-Roubaix and similar races), but still very tough; I wouldn't have any worries regarding the rims strength. I'd stick with the tubs and run it geared.