I got this combo and its getting chewy to rev up after 5000RPM

440RB->500cui 11.5:1CR Stealth heads OOTB Edelbrock RPM Intake
950cfm Holley Aluminum Street HP 4150
Headers, 2,5 Exhaust with X Pipe
256/260° Cam with 590/602 lift
1964 B-Body
2000RPM Stall Converter, 2,76 rear axle

I know this is a unusual combo for, but my goal was high speed driving on the Autobahn in germany and in general it does that very good and still has some good
street manners. I understand the heads are the worst bottleneck currently but I won't be able to change them shortly. I have the feeling I could use more carb as I had to step up the main jets to 94/99 so that its not getting lean (AFR monitored with FAST)

I'm looking at those options I have:
Edelbrock Torker II with 1050cfm Carb
I might even get a M1 Intake with Dominator Flange and than 1050 Dominator carb
Complete 3' Exhaustsystem so it can breathe

What would you change first?

Thx