I have been following your build with huge enthusiasm, especially since it is a rare M90 build, your build just looks so professionally put together, I'm so excited to see what you think, since I am greatly impressed with my m90 build and the immediate response, I finally settled after three different pulleys on about 6.5 to 7 PSI on 8.9-1 and a 4 degree advanced cam amd running about 4 degrees static advance, I'm thinking with the longer stroke and because you can run a little more boost with a carb you will probably be able to run 8-9 psi easily if its set up similar to mine. I don't know any specifics of the build, but I bet you get 325 to 350 horses, I think mine is in the 275-300 range.