Yeah, I think you COULD be wrong about that
From your other post about your recent run, you've done a great job of getting some good performance out of them, but they're still coming up about 70-80 hp short of what good porters are getting out of any of several popular castings on setups like yours, whether the porters be AI, LE, Speir, Lingenfelter, Gallant, ...... and whether the castings be AFR, GM, TFS, Brodix, ....