It would really be neat to have a 300hp inline, but you can build two small blocks for what that engine would cost! The 292 is a low rpm torque motor made to pull heavy trucks, gear it down and use the torque, not the rpm and it will live longer. Go to the Inliners site and check out some of the cars and trucks, then get the Power Manual about 6 cyl's and read up on all the tricks. It takes more than a cam and carburater to make 300 horse! Joe