Theres lots of small differences, I only gave the quick outline, i agree with you that the blacktop flows more and makes more power, I guess I'm used to a crap load of torque so hence why I'm slightly more tentative to the silvertop.
But please if you do one thing replace the rods with forged items as the stock ones are weak and don't like revs lol, hence why toyota rev limited it to just past 6 haha
Karl.