First the pistons are flat tops with a Fel-Pro head gasket and H89 head the compression ratio should be around 11.5 to 1 depending on the chamber size (the heads vary between 29 to 31.5ish). If you CC the heads you could open up the chambers to get it down to 10-1 to 10.5-1

As for the duration yes that is advertised, I do not have the cam card. Delta Cams could probably give you the specs

Additionally I have a 1200 cross member set up for a A15.

Tom