I have a set of Dart Iron Eagles(215cc) and my grandfather just gave me a set of 292 heads that have been ported and polished. I dont know any flow #s for the 292 heads. The only thing I know about them is that they were on a 13:1 406 that he had in his 86 Thunderbird(tube chassis car)that ran 9.40's. So, I know they flow well but do they flow as well as the Darts? Here are some pics of the 292 heads. Not sure if they will help but.....

http://pg.photos.yahoo.com/ph/jst8a50/detail?.dir=d696&.dnm=dde6.jpg&.src=ph

http://pg.photos.yahoo.com/ph/jst8a50/detail?.dir=d696&.dnm=2382.jpg&.src=ph

Oh, they will be going on a 11:1 406 with a .576/.582 solid roller, Vic jr.,800 Holley, and NOS Cheater System.

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1981Z28
355, 11:1, 215cc Iron Eagles, 3500 stall, Crane Solid cam, Vic JR intake, 750 D.P., CSI waterpump,NOS Cheater System, 3" X-pipe w/ Spintech mufflers
12.16 @ 110 n/a
11.15 @ 121 N20

Any suggestion would be a shot in the dark. I'd spend the $'s to have both heads flowed and cc'd. Then you could make an informed decision.
To make a 9 second car doesn't take a tremendous head on a 400,, as long as it's a super light car http://www.nastyz28.com/ubb/wink.gif

Those are the 292 heads??? Wow they look huge compared to stock. They look more like the 215 head to me http://www.nastyz28.com/ubb/wink.gif

My heads look just like your 292 heads they are matched to a special intake gasket(bigger holes than a standard fel-pro)
and my exhasts have more porting than those in the pic, my run great, but if i didn't have money in them id'a went with new stuff will more technology in the runner shape, combustion chamber thats a hard decision you have to make only way to know for sure would be flow'em

I am thinking about having them flowed. I just dont know of anywhere around here that can do it. Anyone have any idea how much that usually costs?

I wasn't aware that even the old muscle car 186,041, 292, and 492 heads would port out that big without breaking through somewhere! Those factory heads typically started out with about a 160-165cc runner size. I'm impressed!!