Hi John
I think you'll find if it's not to late you would be better off to go with 3.40, the performance is much better and faster, I have set up a demo site if you want to take a look http://nop34themes.co.uk/ here.
I know you said it's on a dedicated server so it's not an issue but 3.40 is currently using around 220mb once up and running
which is a huge difference to 3.30 where it can go to over 600mb, also from a SEO perspective the page load times are much quicker.
I think you'll find if it's not to late you would be better off to go with 3.40, the performance is much better and faster, I have set up a demo site if you want to take a look http://nop34themes.co.uk/ here.
I know you said it's on a dedicated server so it's not an issue but 3.40 is currently using around 220mb once up and running
which is a huge difference to 3.30 where it can go to over 600mb, also from a SEO perspective the page load times are much quicker.
Hmmmm OK thanks Ron, it wont be easy because its heavily customised but looks like it might be worth it.