i am going to be ordering a Skunk2 Intake manifold and throttle body shortly, but i dont know what size TB to get.

If the application matters its going to be a N/A h22a4, eventually with cams.

the choices are 60mm 66mm 68mm and 70mm.

too big and you will have terrible throttle response, too small and it will restrict the flow, so what do you guys recommend?

 

unless you plan to have the IM matched to the TB, you should get the size that corresponds to the IM inlet bore. Without doing any calcs, I'd take a guess at the 66mm being a good size for an H22.

Velocifero should have more insight to offer on the H22 since he has one.

 

Send it yours or a spare to www.maxbore.com - same results, less $$.