The first question I'll defer to Doc, but the dual pattern is available through the group buy. I believe the stock spec is -.140 for the installed piston height. Typical is a bit more than that but it can vary a lot. The only way to know for sure is to measure it. Someone posted cc instructions using a horse syringe, do a search and you should find it. The problem with going by stock specs is that virtually no engines were actually built that way. Manufacturing tolerances were quite loose so the actual measurements are all over the map.

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David Kight
'62 Valiant Signet, White
'98 Dodge Dakota
'06 Jeep Liberty

Growing older is unavoidable but growing up is strictly optional.