Hi, You dont say which engine But 68 cads use 400+ cubic inch engines. It is the same as the 327.s. This is a very important procedure and MUST be done in stages and in a certain bolt tightening sequence You start at middle top and work your way around the pattern to just snug up the bolts. Then to 25 lbs following pattern Then 50 lbs Untal you reach your correct torque. DO NOT OVER TIGHTEN. You have to go on line (say Auto Zone site) and get the correct pattern and torque .
If you have installed new gaskets make sure they are installed correctly. should say this side up or right and left. If you don't find your spec's on line I can look them up in my goood old school books for you. Mike.
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