2800 is a little much IMO for 323 gears.sorry cant point you in the right direction for the tranny mount.so does the car have a rupity rump idle,or is it relatively stock?
gosh, its sort of hard to remember. for the 5 minutes that i drove it i know it was VERY loud. but this is because it had about 3 ft. of pipe coming from the headers with no mufflers.
it wasn't a choppy idle though from what i remember.