Without knowing the cam, I have no idea. If you don't know where the 351 and cam came from it's just impossible to know just how mismatched that combo is.
Stock 5.0 heads are weak on the 5.0, on a 351 they are gonna be chokers.
I really doubt you're making 280hp at the flywheel with stock unported E7's. Not to mention stock 5.0 headers? Ouch. Unless it's cammed decent I wouldn't expect you to get more than 250hp out of it.
Who knows, that thing could have a weak *** 351W from a mid 80's Crown Vic making like 180hp.
Just cause it's a 351 does not mean it's got power.
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