RE: You Can Do Engine Problems
DON'T LEAN IT. You will fry bearings. You need to fix the tank height. Don't just assume the designers know what they are doing. The tunnel under the nose is for a rear exhaust tuned pipe engine. The only 2 engines I found with rear exhaust are 140's witch gos ageist GP recommendations not to over power the plane.
Plan A: Cut the tunnel out and make a hatch then adjust the height of the tank using foam on the top and bottom of the tank.
Plan B: Perry Regulating pump, or stand alone regulator.
Plan C: Grab an OS or YS pumped engine.