If I'm not mistaken the writeup at the Planet was referring to jacking up the fuel pressure that high if you were using stock 2.8 injectors????

Original post in this thread indicates TBI mods, so I'm assuming either a modified GM 4.3 TBI or a Holley Big-Bore was used, either case you probably wouldn't need to increase fuel pressure much (if any) beyond the normal regulated range since those TBI's are running higher-flow injectors than stock 2.8 items.

I'd expect that if one were to crank in a ton of excess fuel pressure the ECM will be able to limit it to some degree, by chopping injector pulses. But it would run terribly rich in Cold Loop.

Quite an old post to resurrect, wonder if the problem ever sorted itself out, eh??????