i think its fair to say that most folk feel the 16v would continue to pull well, beyond the usual rev limitations, but just how far, and how often, with the usual reliability is a huge unknown.
the typical mod was to sling in a squadra chip for the 16v motors still using the ecu and injection, which i think most owners agree was simply a continuation of the stock fuel/ignition map for a further 500rpm or so instead of the stock map just dissappearing at 7200 (i think!), one of the crudest rev limiters i've ever come across it has to said! ha ha!
i think 7000-7500 is enough for a stock 16v or 8v motor and hydraulic tappets to cope with, occasionally, not live there, and be quite a rewarding drive, but to pursue revs beyond this is where i would start to recomend looking at steel internals, mechanical tappets, etc etc
surely 7k is enough isn't it fellas?
peak torque is well behind 7k on both motors, so is this point a little mute for a modified road car?