Finally completed the X2 conversion and will be running it today at a smaller local track. Really looking forward to learning the new Buggy characteristics.
I ran into similar issues with the single one peice engine mount (slightly dremeled off the front right upper corner for clearance) and the right rear of the engine mounting block area (on OS Engine).
Also, dremeled the upper portion of the wing mount, to provide clearance from the shock tower, especialy when the car flexes.
Will be trying Chad's latest recommendation setup on the shocks (1.35 pistons and oil) and will post results hopefully by tomorrow.