413 in the 68 barracuda

I think after some measurements have been taken it’s going be pretty obvious this build is going to want closed chamber heads.

This 413 is going to be a challenge to get what im trying to achieve.

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My .02….
There is no practical upside to using the 413 block.
If it were a finished short block that would satisfy your needs that would be one thing, but to pour money into it makes no sense to me.
Just save yourself some $$$/headaches and find a 440 block.