I cannot believe that the plans showed the throttle linkage going down the center of the tank area. Definitly must change that. The tank should be as close to engine as is possible and center of tank should be in line with carb needle valve,vertically. It's not nessacery to wrap in foam but do secure it in some way but not in permanent manner not glued. The linkage is usually running down the side of fuse directly off servo arm and can be bent after passing through firewall to connect to throttle arm.