Goddamn it. I am so sick of my LS right now

Someone could set it on fire and i would not care.
I have done everything in my powers to do modifications to this car in the most thought-out, not-a-dollar-spared kinda way, but i just cant win.
My Exhaust... On my 3rd set of extractors in 3 months, and still no joy. Yes, they are of the right design and all, but the workshop that did them (Another one of the best in Adelaide) is no longer interested in helping me. The 3-1 collector leaks like a sieve. But they refuse to listen to me and put a mount from the 'tractors to the bottom of the gearbox/diff casing. "Dont need it" they say. So, now my exhaust has so far cost me $600 at one place, and another $400 at this one. And still no joy.
Oh, and the roof is
STILL creased from the first exhaust place, as they claim no responsibility for it. Arsehole. He isn't worth the price of the carton of eggs to throw at his workshop.
As for this bloody radiator.... Jeesus, i have never had so much trouble with one thing on any car i've ever owned.
I have taken the advice of many, and reverted the flow of my cross-flow rad, back to the original left-to-right configuration, with a filler neck and cap on the top hose. Another $100 down the freakin drain, plus a new Davies-Craig fan, another $100, as this has made my situation worse. Can't keep the damn thing below half on the temp gauge, let alone sit in traffic. I started it up the day i put it all back in, let it idle for around 10 mins with the fan on, and it sat on the thermostat. Now that i go to drive it, i can barely keep it off the red. What the F**k?
I tried me mate Willys radiator, which was proven to be better than good in his car, even on a 43* day, but it just couldn't keep my car under control. Ran bloody hot.
Oh, and now a new problem has arrived. A sticky throttle. I dunno what changed overnight, but now its all stiff, and it wont return to idle. It just wants to keep goin'. Bloody scary with lots of grunt, i tell ya!
So, i 'borrowed' a Weber linkage kit, as used on many cars i have seen, but this is still no good. I bolted it on, the exact way it came off Slidey (Yes, SG's car) and this is no good. I can't get full throttle, AND it is a heavy pedal which sticks.
Sorry to whinge, but I've had enough of this crap. No wonder people drive Ricers.