does anyone make high compression pistons for a 170

According to this, notches would be needed at this lift/duration for some level of head milling:

http://www.slantsix.org/forum/viewtopic.php?t=55723&view=next

Charrlie S would likely know.

Is this engine for the street or what? Auto trans or manual? With stock CR and this much cam, I would expect this to be doggy at low end. (Have a not looked at the LSA however.)