Wow, so much misinformation about the supra in this thread!
The entire design base of the supra was to be a highway touring car. The comfort and speed is unbeatable. It still handles suprisingly well for being such a beefy tank car. Not as well as a 240 in stock form, but suspension upgrades make it a nice handling car for what it is.
The headgasket is not that big of an issue, the stock one tends to blow after 100k miles if its not modified. However, you do not need a metal headgasket. They are better of course, but not must have part. A new headgasket from toyota with some ARP bolts with hold plenty of horsepower.
Speaking of horsepower, I have a video of a supra with a walbro fuel pump, new turbo elbow, upgraded compressor wheel on the turbo, and a lexus AFM making 420hp/438tq at 18psi! Thats with nothing but stock parts aside from what I just mentioned.
Hard to find parts? I'd suggest you search abit before you make that claim. There is plenty of aftermarket for the mk3 supra! From my experience its no more expensive to mod than a 240.
(high res
http://members.aol.com/r7mgt76/k1.jpg)h ... ide/463369
Enjoy