That’s enough time off

If I lay around any longer I’ll get lazy. Well I enjoyed my time off but 1.5 days is enough. The valves didn’t get here for the heads I was working on so I grabbed a Victor340 to do for a Keystone Raceway Park racer.

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How do you decide where to scribe the lines? With the intake manifold gasket? Since there's slop in the bolt holes, how do you decide "where" is correct?