273-4 vacuum leak

Hello,
Thanks for the replies. We found the problem; intake manifold bolts were not torqued. Redid them and no leak! The suggestion to retorque the intake AFTER the two 20-minute initial break-in runs was part of the written instructions from the machine shop (I didn't READ everything first)!
BTW: today we complete the reassembly. Engine running, PS unit in place, console installed, carpets and seats back in place. Ready for some on-the-road break-in travels.
Thanks again