For not much more money than the Aeroheads from Indy, he could have a set of Stealth heads.
Another good option, but almost double the cost, and they are similar to the 906...
A 906 is similar to an Stealth ??? ... which is a copy of an Edlebrock ... hardly.
Any open chamber Chrysler head couldn't be a poorer choice for a performance type build given the pisspoor fuel that is available today. The only reason to use one is because a racing class REQUIRES one or you own a stock restored show car ...
If one is going to run an iron head the 915, or even a 516 with the exhaust valve replaced with 1.74" would be a better choice in an unported head.