You need a custom ground cam for your motor.Decide on your heads first.Have porting maximized for .200 thru .500 since you have a cam rule.
Hughes engines has done a fair amount of intake research and porting.They do cast iron units as well.Check with Dave and see what he thinks.
Indy EZ'S might be the way to go if you don't want oil lines.
Dwayne(fast 68) is pretty darn good(as are several other members).