What usually works quite well is to run your throttle push rod along the fuselage side and well out past the engine throttle connection then bend a U turn into the pushrod and bring it back to the throttle arm. I usually use a nyrod up to the firewall where I then thread in a long piece of metal rod to extend it past the throttle arm and them make the U bend and bring it back to mate up with the throttle arm. The use of a ball link on the throttle arm also simplifies the installation.