According to the Chrysler engineering report I have from the 1960s- the 426 DOdge Hemi achieved a peak VE of 90%.
An RB wedge I would estimate as lower than that- say 85%.On the other hand- if you're using good flowing cylinder heads like modern Edelbrock RPMs or xtremes , an Indy may be, that flows close to 300 CFM at peak lift (original 426 hemi flowed about 270 CFM) rather than the 230 or so of the 906 cyl heads, assume 90% +
A modern engine, such as some of the engines I have been involved in the design of:
Jaguar AJV8 = 95-97%
Aston Martin V8 Vantage= 98%
Jaguar AJV6 3 litre= 101%
BMW S54 M3= 106%
Jaguar AJV8 supercharged= 140-150 %