Wanna go all out, check these out.
http://www.araoengineering.com/Ford/clevelnd.htm
I saw them first pointed out on the Pantera forum and more recently, the GT40 forum. Haven't read any reports from anyone who's used them though. I'd like to see a better picture of the rocker arm setup. They're not supposed to be inexpensive either. I've read $4000-$5000 per set but have never confirmed that. They aren't in my budget at present! I'll see how the 2V's do.
Also, check out
http://www.pim.net/newprod601.htm
for an aluminum "3V" Cleveland head.