I realise that New York is not a 'hot' state (except occasionally), but I would still recommend the fitment of the 3.5 litre sump---they definately help keep the engine stay cooler.
When you change the rear suspension arm bushes, make a careful note as too where the washers go either side of the bushes--THIS IS IMPORTANT. The washer/shims adjust and control the rear suspension angles. It can be a real pain-in-the-bum trying to set it up if you get the shimming wrong, (0.5 deg of TOE-IN total), and it must be the same (i.e. identical) each side.
Got it. I figured I’d reuse whatever shims or washers are already there. And replace exactly as I found them. Do you know if the bushes need to be tightened under load (or load simulated by jacking up the wheel hubs)? I’ll look into the sump.