Packardkid,
I'm trying to take some measurements off the picture for a growing database so I can calculate torq/power etc.
If I scale the pic so rod length=8.5, then I get
deck height~12.3
compression height~2.5
Rod journal ~2.25 (about right)
Bore~3.5 (sounds right)
But this all puts the piston almost an inch above the deck.
I must be measuring wrong or something, maybe you have the right numbers?
Another useful thing would be to degree the stock cam before you grind it, measure valve events at say .006, .050, .100, .200 lobe lift and max lift (probably worn a bit). Modern specs like .050" lobe lift events are pretty standard now but nobody knows em on this old stuff unless we go back and measure it!
I will enclose a link to picture of a cutaway of one of these. It seems that water is pretty close to everything so any major porting would be limited (though I will still do the best I can. I have thought maybe setting the block up on a mill cutting the ports out and installing sleeves in the ports but I don't know if it will seal.
https://www.dropbox.com/s/ni9mb6iclwio86k/618_519043579c803.jpg 
