Best headers for 360 in a valiant

ch1ll said

but that would require frame rail bracing as inner fender aprons are structural components.

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On re reading this…. While the inner fenders are indeed a structural part, frame rail bracing isn’t needed. If you’re building a very high powered car, then bracing everywhere should be done.
It’s not needed for a street hot rod.

The amount of missing material is not that large.