Which air gap manifold?

Thanks guys, you have me still in two minds. Truth is, the car will never be making less power. so i'm tempted to go for the rpm higher performance option.
The car is for fun use only so i can afford to compromise. Currently i have the XE262 cam and the 'stock' ish Performer intake.

Interested to know what extra power i will feel by moving to XE268 cam and air gap performer intake,and if it will hit drivability very much, if at all.

I think you'd be happy with the power gains by switching both. I have a XE268 cam and the RPM Air Gap intake. I used to have a Edelbrock Torker 340 intake and switched to the Air Gap. The power increase was definitely noticable. Made it alot easier to spin the tires.