Deck height

you need the CC of the cylinder hear
bore and compressed thickness of the head gasket (Felpro is .037 thick for both 3.4 and 3.510 bore gaskets)(stock steel "shim" gasket is .021 thick for both 3.4 and 3.510 bore)
Cylinder bore
Piston to deck height: you can do the stop method but its alot of work... just use a dial indicator and turn it till it stops coming up and measure it...

then use this calculator
http://www.wallaceracing.com/cr_test2.php
1-Quote: you need the CC of the cylinder head..............Ok I can get this I believe with no problem.
2-bore,for both 3.4 and 3.510 bore gaskets...........It sounds like there is more than one size bore gasket. Can you elaborate on this, which should I be asking for and why the different sizes?
3-Piston to deck height, you can do the stop method but its alot of work..........what is the stop method? Do you mean the piston stop method? My head is already off on this particular head so using a dial indicator is not an issue for me. I do not mind the lot of work part if it means more accuracy.