I believe I looked at those.. different specs..
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Sounds like the same , only different..
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I always wonder, why they cant sell on their own merits.
I think the 315 is fairly close to one of the Megas..
I will say this, with Webers, stock ports/valves, but with good valvejob, and 10.5 836 kit, I am really sierprised at how much midrange I was getting out of a 4 cylinder.. really nice on the street.. I would like to try a 327 RC, but I fear it may be a tad peaky..
Still looking for another 315 or 327 though.. in good shape.