It sounds like these will be some pretty decent heads and a step up from Edelbrock's RPM heads. However, the flow numbers you got are much lower than on the Hughe's web site.

Does it have a lot of meat left in the port walls for making them bigger all around?
If so, they would make a good CNC candidate (to keep labor costs down removing all that metal).

Rocker arm offset and push rod clearancing are likely to need attention in any build.