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dlowe...
To answer your question, if you stay with a 65-78 block, you will be fine, as they all use 6 bolt bellhousings. Of course your heads will work on any Windsor small block or 289-302.
However, I really doubt you need to search for another block. I have a D9 block (1979) that I had bored .060" to make a 425ci stroker. It's been running since March, and it will sit and idle at 180 degrees all day long. It was also pushed very hard on a dyno...I really doubt you have anything to worry about unless you plan on some really high combustion pressures as with forced induction or nitrous.
I've been told the only blocks that you need worry about are the late 80's and 90's blocks...they were thinner and less-beefy to save weight.
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