the 350 heads will have bigger valves that will clear easily. the only thing that you are missing is a cam to match.
heads are nice, but they are a waste if you don't have a cam to work with them. the additional volume won't be taken advantage of.
the heads will help you, but alone the benefit will be minimal. get a cam and do both swaps at the same time. that way you are taking it apart once for all of the benefit instead of 2 disassembles to get to the same point.
later
tim
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