Big block port layout

After owning 915,452,906,346,stageIV,stageV,Indy sr, and Indy ez. I know it's not a stock layout. Don't know about original B1, or Fred brewer. To small for predator. This is on a Hogans sheet metal single 4 tunnel ram. Going to give them a call tomorrow to see if number on bottom is any help.

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