Thinking of switching from M1 single plane to LD340 but LD340 would need to be milled to fit. Is it worth it?

for real find a set of x or true heads j sorry we old and know at 7k they work . promass
I'd say try it but the only problem I see is you got to mill it to fit.

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you are the odd the 340 x and j ar old but i have a aar motor i can worry why they ar old i have. i have good worth ks we and i are cranking motors now . now mine are hi dollar.