Problem solved.. another way
Since there was no way of telling what # i am on the waitlist for LHR-LAX, i've decided to upgrade just the outbound LAX-JFK-LHR, which luckly had 1 more seat available.

Now, allow me to stress you guys with another question

- i have't flown that much on biz in widebodies, so my question is, if i were to choose the bulkhead seats (LAX-JFK= 767-200) (JFK-LHR=777), will they have as much room as the other seats and/or even more ? or will they have less? should i choose them or not ( being 6'6" tall and all... )

Thanks again for your help

Chris