I've been researching intake manifolds for the 289. Edelbrock's manifold is rated to 5,500 rpms. Weiand's is to 6,000. I'm wanting to build it for low end torque and throttle response, chances are that the camshaft will be ground with a max rpm of 5,000 rpm, of course I don't know this for a fact as I haven't contacted Ed yet but will be soon. My question is what intake would work for me, also carb cfm? Should I just let Ed handle the cam, carb, intake, and probably the cylinder heads? I'm thinking of using the edelbrock e heads. I know that the afr165's are good but I have to stay with in my budget. I'm going to use better pistons, a custom grind cam, so I hoping that the e heads would work for me.