as for the passenger side footwell heatshield, its only a passenger, who cares about THEIR feet!!! just kidding, but that heatshield catches more tools than anything else on the car, really an annoying pain. heatsheild between the carb and intake would probably help alot in texas. my 72 auto GT didnt have one, so i put one on it and i did notice it started easier after hot-soaks. maybe the most important one is the one for the passenger side motor mount. the exhaust manifold just constantly bakes the engine mount. seems to be cars i've had without this shield have a broken engine mount, while the cars i've had with the shield seem to have some life left to them.