This might help:
http://www.inliners.org/tech/heads/headindex.htm

However, I have a '85 292 and wasn't able to find any info on my casting numbers. So don't get your hopes up. Not sure what good knowing the head casting is on a 292 anyway. They had big combustion chambers and low compression, not really worth much for performance.

If you want performance find a 250 or 194 head to boost compression. Your time and money would be better spent working with those.

also be aware that if you are using stock type pistons, most aftermarket stock type pistons have deeper dishes than the OE pistons, so you'll most likely be loosing compression anyway. There are way to get around this by using particular kinds of pistons and the guys on here can help you, but it's just another thing to consider during your build.

Also it's only a matter of time before somebody mentions lump porting. Unless you plan to race they aren't really necessary. Although they do dramatically improve the performance of the heads.....just very expensive to have installed. (approx $550-600+)

'40 Studebaker project Chevy 292 powered.
'51 Chevy business coupe 216ci inliner
Inliner's #5360