small block fresh up

moper said

If you want to spend a little, my '66 Formula S used the 68-71 hi po 340 manifolds and they fit fine.

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When you used those manifolds, how hard was it to fit the exhaust pipe to the driver's side manifold in the 66 since the 340 manifold is shaped quite a bit different in that particular area as compared to the stock 64-66 manifold?