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

I'd rather use a vic340 w/7 /16 spacer blended aka used in the plenum development.
The m1 is nice, but it does better AS IQ52 SHOWED US IIRR by machining a plenum insert/spacer that equalizes the shape toward a square bore carb.

That manifold was developed with/for a spread bore carburetor. Be it flow or distribution issue... the issue exists.

Ty.