It looks like the KB278 is the only one that will give me a good quench area clearance of 0.037. I will need to have machine work for the others. I was hoping to get 9.5:1 or 10:1 CR. It looks like that wont happen as the CR given for the 278 is 8.8:1....

Piston Style-KB to consider-quench dome HT-C.R. at 90cc-Option-Compr. height-Quench dome above deck-installed C.H.-quench clearance
step head-----KB2360600------.075-------9.9-----------Yes---------2.057---------0.047------------0.028-----------0.097
trough--------KB146060------0.075-------9.9-----------Yes---------2.057---------0.047------------0.028-0.----------097
big stephead--KB278060------0.200-------8.8-----------Yes---------1.992---------0.107-------------0.093-----------0.037
flattop--------KB237060------0-----------9.7------------no---------2.067--------------0.018--------0.018---- ------0.162
cancelled----- kb184-- -----0.140---------8.9 ----------no--------- 1.992----------- 0.047 ----------0.093 -----------0.084