What camshaft spec for 425 hp

PG Duster said

Not yet, I bought the car wi

I bought the car with the rebuilt engine in it. I don’t know what cam is in it. The seller did not have the cam spec, but said it is a aftermarket racer brown cam.

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Being a magnum I assume it’s got the factory 1.6 ratio rocker arms? or does it have aftermarket roller rockers and do you know what ratio they are? You say it has a Racer Brown cam, doubtful it’s a reground hyd roller, Not sure they do hyd roller regrinds or offer their own. Is it hyd flat or a solid?
Those EQ heads have excellent exhaust/intake ratios where a single pattern would likely be used. I’d say determine what you actually have, run it a few test n tunes to suss things out.