In line with pokslok above, get it reasonably long and high. Stocks are easily and cheaply cut down, and its no great shakes getting a comb bent down or slightly shaved. You can't shave a low comb upwards!!!If you can't get a good fitter I personally would go for :-

14 7/8" length
1 3/8" at comb
2 1/4" at heel
with just a touch of std cast at heel (don't know if your left or right handed)

This also is not far off AYA std european dimensions. Remember, very rarely will a stock come out exactly at the dimesnions you give - a case of 1/16" is near enough! The above dimensions suit me - I am 14.5 stones, 5' 11", and am told I am stocky / well built.

The other aspect is that different fitter give different dimensions. When I had my Browning built I knew what fitted me from 30 years experience, and I gave them the dimensions. I would much rather chose my own dimensions through experience rather than have a fitter force onto me his interpretation of how a gun should fit !. Two golden rules, a stock is better higher and longer than being too short and too low. Cast is not so important. I even shoot a left handed cast english gun well - the comb is very very slim and the face is slightly scouped. The benefit is the recoil is more directly in line with my body - rather tahn being on my shoulder extremity - might start a new trend!!! perhaps the old gunmakers new something afterall...

Jonty