Problem is the swirl port heads have tiny ports. I believe, due to the thin castings, they can only be made a bit larger. My 260 has similar sized ports, the dualjet overwhelms them at full throttle. The open, ram air set up and 2" dual exhaust with 3.42 gears makes it acceptable. The small 500 cfm carb is a smart idea and no doubt helps. Those tiny ports can only take so much air and fuel. Those gauges look great, by the way.Nothing wrong with Edelbrock in my book big matched ports are the only way to make power the engine has to breath!!