Which single plane intake?

I picked up 2 tenths going fro a torker 2 to a victor 340 . Both manifolds had port work. With the victor I had to leave at a higher rpm or it would bog. You cant go by the rpm ranges they list per manifold if you are going to use them on a stroker.More cubes changes the range . I would say drop all spec 500-1000 rpms .