How much does the engine/transmission combo weigh and how does it compare to the KA or other swaps like the RB, SR, LS1, and so on. I’m thinking it isn’t much lighter (or marginally so). A higher revving engine doesn’t necessarily make the engine better, it just means it revs higher, and may need to in order to get enough power out of it. You want to have power anywhere possible, not just at redline.