Not sure why you want the motor to still be pulling at 7000 rpm but if that is your goal then you'll need to go with either a 451 or maybe a 470 motor. If you build it bigger than that then even the Max Wedge sized heads won't be able to feed it past 7000 rpm.

If you want a really high revving low deck motor then use B1 heads. But that is a much more expensive project than what it sounded like you were proposing.

You should be able to get headers for a low deck 470 with Indy heads. Not so sure about the Victor heads since the ports are moved. Lots of things are related to each other so you have to think thru all of the issues when you select a combination of parts.