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They do have the same port as some of the rec. port BBC head which is 320 cc's.
I have done some flow work with very good results.
Looking at some flow numbers I would guess there is enough head to...

I do have a set on a customers 496.
He has been running 6.70's with a hyd. roller,Victor,floed 850,4.56 gears,4,000 stall etc.
I always try and explain to the customer they may or they may not need...

The last set I bought for a customer was junk but the pair before it was very good.
When I say junk I mean they required a lot of guide and seat work.
You might be better off buying a set already...