help strokeing a 225

198 rods are .300 longer than 225 rods. The CRANK has a shorter throw than a 225.
You can run a slant at 6000+ rpm's if you do head work and allow it to breath.
An Offfy intake can be put in place of a 1bbl with some increase in HP. How much will depend on Your engine and what all is done to it.
Frank