Ok, so Ted already answered my general question about valve size and such via email when I signed up...

but...
For a 292,
I am still trying to find a head to use. I'd like to use stock. Initially I had some ported ECZ-G heads, but my machine shop didn't like the valve seats, or how much they'd been milled.
I had access to some 471 heads, but I really don't want to go backward with the compression ratio. Rather stay as close to 9-9.5 as I can. (maybe that's unnecessary) 
I got some other ECZ-G heads that were "nicer" but there are cracks in them, can be fixed, but my machinist thinks it'd be a poor choice for my build.
NOW
I have a set of ECL-C heads that don't look to have ever been milled. The valves are smaller of course, and Ted has mentioned that it's not really beneficial for street use to have larger valves...
BUT
I still want them.
Machine shop found another set of ECZ-G but it's $400 just for the bare heads... my ECL's are free basically.
I have the stock heads off the engine C1TE flavor.
Question: Do I let the child in me win, and have the shop grind out the valves to the larger size, or just have them build these ECL's stock and be happy? ... OR use the stockers (C1TE)?

ECL's 1.78 intake now, C1TE have 1.64 intake, ECZ-G have 1.92

Follow up question... are the ports different on stock heads between the different applications?

Thanks!