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They were around 280 as standard with the 2.080
Arent all sbc aftermarket heads around 300cfm ?
Probably, I just was never allowed an aftermarket head. The very best bow tie phase 2 I had, ported, was under 300 cfm. The exhaust was at 244 on one set, but I never seen 300 cfm on a factory 23 degree head. Wish GM would have copied a few of them. Later the vortec bow tie would flow around 280 with just a good valve job, and a 2.02 intake. But I had quit the class at that time. And they were quite impressive. Some ran 9.20’s with that stuff at 10.5 #’s per inch. Which was .4 better then our best. That’s a load.
 

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I would contact someone like Chad Speier on here and get with him to see if he has a program to do an I take for your setup. To really get the full potential from your combo it will need a custom ported intake. But if you want to run an Out of the box intake and just bolt it on then go with the Holley 300-110 like mentioned. Just my humble opinion
 
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