Technical headers

I guess I misposted what I need but what I want to know is what are the best block huger headers for sbc vortec heads.# 5&3 & 6&4 plugs are closer than the older heads.
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What are you calling Vortec heads? What are the casting numbers?

 

HEDMAN..the best

 

Casting #

Casting #12558062

 

It looks like the exhaust ports are raised .100 although I think the ports are the same spacing as a normal SBC.

 

Thanx, Roger