OK as per &amp;quot;what did we do&amp;quot;,  sleeves are out to accept a 4 inch piston, block had to be machined to accept them,  crank was &amp;quot;worked over&amp;quot;, to get a 4 inch stroke. I had a very good freind that built sprint car engines that wanted to make a &amp;quot;pulling engine&amp;quot; so I have no idea what was done to get a 4&amp;quot; crank with 4 mains into that block. RPM&#039;s are run at 2400 for pulling, it was necessary to cut block webbing some to have rod clearance and I fully expect to made a swiss cheese block everytime we pull it. We built this engine in March of 1977 to fit rules of local stock antique club, stock block, stock carb, (or pump on a diesel), intake and exhaust manifolds stock.
We were very successful until we had the &amp;quot;pleasure&amp;quot; of being torn down on track one evening. We were invited to never come back. Daughter got it as far as scales at a &amp;quot;show tractor&amp;quot; pull last Sept.  We were told we could show, put forget pulling. Some people have no sense of humor.
If you start with a Super 88 or Super 99 block it is much easier and a whole bunch cheaper to get &amp;quot;ponies&amp;quot;. 
&amp;quot;Killer&amp;quot; was so named because it is so &amp;quot;lovely&amp;quot; to steer.