My Nexstar uses the "iso engine mount" or whatever; it's two rubber boots that go over the engine's mounting holes, then two plastic blocks go over the boots and get bolted to the engine mount. The white blocks are bulging out around the rubber boots, which at first I wasn't too concerned about, but then...

I can't get the muffler on the engine; the engine is mounted too far to the left 'drivers' side of the plane, so the muffler hits the outside of the engine compartment when I try to bolt it on - I need about 1/8 to 3/16" to get it to work.

Should I bag the iso-whatever engine mount and just use the metal brackets? I think I might be able to get things to line up better this way. Other option is to cut more off of the side of the engine compartment.

I thought the plane was made for this engine - OS 46AX