When good is not enough, Camshaft time again.

I think if you’d like to pick up 1/2 second you’ll need to jump up pretty far. Like 10-15 degrees at 050 and maybe a few more degrees of split, and as much lift as the lobe will tolerate. If you’d can afford it a solid roller will be the best. I’d keep the lobe sep pretty wide and let it run hard up top, (like 114 degrees) it won’t be lacking torque with 512 cubes. AND I would send your intake to Wilson and have it professionally ported at the same time. That’ll get you a good deal and those cooper cobras will have no chance.