Eddies Vs 915 J's

A few thoughts - the Js with a decent valve job should flow around 220 at .550, but you're not anywhere near that lift. The numbers at .300 lift would be more important and the Js should be around 175. The numbers I've seen (in testing my stuff and what I've read) give the RPMs about 10 more cfm from .200 or so up throughout the lift range and having about 20cfm more at .500.
In terms of the getting "the heads" done - I'm assuming you mean the Js? I think 2.08s is a little much. I prefer 2.05/1.65 for my factory heads when porting at least to a Level II (meaning working the entire port but not maxxing out). At that level they would be making similar mid-lift numbers to the RPMs, possibly a little more. But the camshaft will still limit how much of that better port you take advantage of.
IMO - the 1.6s might add some lift but you really need a new cam to match whatever head choice you make.
The 6bbl is a horsepower robber. Unless eye candy is what you want, stick with the RPM/4bbl combo.
With the right cam and valve springs - I'm sure you can get another 30-50hp but you will need to raise the rpm range you have now to reach that.