Howdy Bert, one thing you could do is tell us the OD ratio and rear tire diameter. One thing I noticed about the article is that with the exception of test 6 (which was an example of what not to do) every one showed an increace of power. Even down at the bottom end it was up 30+ hp. It sounds like your building a stump puller. A port job would help but is not needed without a cam and carburation to take advantage of it. My 2 cents on speculating a stroke increace would be an increace in torque with a decreace in RPM.
