[dwdshelby]

DD, there was a very good article in Mustang Monthly I believe in the April edition detailing the difference between the regular 289 block and the HiPo.

I believe the only difference in the block itself, independent of the rods, crank, dampner, alternator pulley size, carb and heads, is the heavier main bearing caps. The hipo has press in freeze plugs like the ordinary 289 block.

So your analysis is pretty much correct.

Dave