i agree, you can't run those particular 6Xs on a 350...you'll need the 350 version.
if you are building a 400, those 6Xs would be perfect.
if you are building a stock driver 350, then those 94s would be perfect.
if you are building a performance 350, then you'll want the 350 version of the 6X, or just put bigger valves, and screw in studs in the 94s with some port work to take advantage of the larger valves.
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