Which Head??

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IL
Can someone please help me here? I have a milled head and my mods consist of:
Riva Head
Blackjack Carb
Lightnd flywheel
Port-polish
and my milled head on a 61x
I believe i am bored 1 over
It's been year's and I forgot, but pretty sure...

My ? being. Should I get a girdled head? If so, which domes do I go with? I can run 100octane. But, do I really need to? I am trying to get a little more pep out of her. Please, any help would be greatly appreciated..
Thanks Eddie
 
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