shimming motor mounts
i also made shims by my self - just some flat steel stock part, cutting a slot into it, lift the engine a bit and slide it right into it. passenger side was (as far i remember) about 6 millimeter and driverside was 10 millimeter - sorry for the metric
i also had to use shims wiht the former LAengine in order to get enough clearance for the Headers etc. (2 millimeters passenger side and 10 mm driver side)
in my opinion nothing to worry about