I don't know exactly what cam is in my Dad's 454, but I can tell you (and Mark can as well lol) that with a "computer friendly" (lie) cam, Edelbrock intake, and headers, it was about 20% lean. Took a fair bit of work adjusting the fuel pressure to get fueling back in line, and with as much work as I had to do to try and get fuel pressure up, any more fuel needed and it would have required a change of the fuel pumps.
On the potentially helpful side, I learned that if you have the OE 454 fuel pressure regulator that has the "window" where you can see the spring (some you can't), you can shim the spring until it's a hair less than at coil bind, and you will get as much pressure from the pump as it will deliver.
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