call Accufab talk to George Class, he may be able to help you out
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If your shooting for a 1000hp i would not use COP on it , stick with the stock coils or better after market coil packs. The COP seems to have problems at that kind of power levels.

https://www.theturboforums.com/threads/364651-everyone-with-cop-conversion-look

 

1000rwhp is pretty easy with basically stock B heads. Man, those are HOGGED out, lol. The intake port volume of the B heads is already large so I'd be curious as to how much of an increase in volume there is now. It seems that you will lose a lot of power on the low end due to low intake charge velocity but I guess it depends on your set-up and how high you are spinning it. I'd contact Mihovetz to see what he thinks. He's the B-headed Modular king.

 

+1 on the ProMod 88.

 

A buddy of mine bought a blown sbc and the heads were done by Allan Johnson and they were done the same way with no divider between the cyl. and it made 1400 on the dyno , very cool heads , i am doing the same on as set of B heads just not as severe.

Mike