1st need ALL measurements: piston amt in/out of hole(deck height),amt(cc's) of piston dome, cc's of valve reliefs, CC's of heads,depth of open chamber recesses. So you can machine to achieve .035-040 quench & the CR you need(& 9.2 isn't enough) which will go with determining what head gasket you need & wondering what octane FUEL will you be useing? Thats too bad they are not being customer friendly but unfortunately that is all too common. Stay with it,you want this thing right.