Seldom am I here or reply, but I thought this A good idea to and time to post. At risk, here's a bunch of shots on a intake I have for sale at another site, worthy of a look.
It has the wide bolt spacing of the W series heads and the same casting numbers as 70AAR.

It so appears that this intake is drilled as needed, OE heads, W5 heads. The ports are very close to gasket matched. Black marker shows the slight grinding effort needed for a port match.

http://www.forabodiesonly.com/mopar/showthread.php?t=97082