help with dynamic compression ratio

Hello guys,
i need help to calculate my (real) dcr. I hope you
specialists can help me.
Ok, we start with the engine facts:
bore: 4.03
stroke: 3.25
rod: 5.4
head cc: 61
piston: flat top 4cc reliefs
gasket: 4.1 bore, 0.039 c. thickness
piston: 0.02 above deck
cam: intake advertised duration: 274 (0.006 lift)
exhaust adv. duration: 278 (0.006 lift)
lobe sep. : 112
intake centerline: 110
Do you need another parameters?
I calculate a dynamic stroke length of 2.6789 and a dcr of 6.8593.
I´m right? The scr is about 10.5 to 1. Is a dcr of 6.8593 to less? If it is true.

thank´s for input guys!!

Markus

thank´s for input,
i calculate it with a calculator i found in the internet.
Please look at the link. Here is a pdf file with my
computation.
What do you mean?

thank you

http://212.227.100.192/mustang/dcr.pdf