Not Ranked
Steve - 351/400M looks very much like a Cleveland. In fact I have known people to be sold these things purporting to be Clevelands.
Generally a low power motor, I believe that reasonable power can be extracted from them, but it is an arcane science known only to a few - bit like Clevelands, only much more so. Very few, if any, aftermarket tuning items available.
And that is the limit of my knowledge, to which you are welcome.
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Wilf
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