Alot depends on what trans your running.
Even 264s are too much for an auto with stock converter.
The 60' times will be slower than stock cams.
Maybe 256s, if you can find a set.
But if you have a manual, or want to lay out $600 for a hi stall converter,
then only your check book is the limit.......
Bigger cams work better at higher rpm, which means other parts to go along with it,
and ECU mods to allow higher RPM.
Also, on a NA, as you go up in cam duration, higher compression is required,
or it will really loose bottom end.
I think CP does something in the 11:1 range, LIPP has Wisecos in the 10.5 range.
And if you can find them, Cosworth used to make 12.5:1 pistons.
Or go to one of the .8mm head gaskets.
Bottom line, big cams will end up costing more than a mild turbo build :aigo:
So if you do go with cams, do mild ones, as there is less required to get a balanced build.