408 Stroker Short Block Details: Blueprint Engines

Do you remember what size the thread was for the block? (I am changing over to Evans Cooling. Not doing this in the first place makes a HUGE mess)
Not off hand, got them from Advance Auto in radiator section, they had two versions, same threads, a short and longer version. These are the shorter ones, used some Teflon tape, antiseize, and had to slightly bend the little handle wings out as they screw in to open and the ends hit the block preventing fully open. Not much just a little tweak is all it takes