Edelbrock is junk, I replaced mine with a Weiand , plus its a air gap from the 60's which 40 years later is new to Edelbrock intakes
Weiand is the best cross ram I have used to date, tuning is no problem if you know what your doing.
Idles at 650 rpm with 2 X 650's & annular boosters, use square jetting
A Roller motor is the best way to go.