300 on wheel is already quite the amount. Most regular cars on the road couldn't even come close to you....
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Ancient 6G72? That engine had powerful potential although it is not as famous as RB26DETT or 2JZ-GTE. Kinda like the equally powerful VG30DETT in Z32 300ZX. Also another 3 litre V6 Twin turbo... But I'm sure your dad's car is quite the fuel drinker isn't it?
I thought 6A13TT Galant is VR-4 variant instead of VRG? Perhaps the Galant is newer than your GTO? Galant is lighter as well.
Hmm, MR-2 is a rear mid engine layout and the transmission can still fit your front engine Celica? I'm not good at this. Actually, originally your Celica is which variant? Not GT-Four?
If a 200hp plus Celica's clutch is heavy, then those clutch in heavily modified Supra, Skyline GT-R with like maybe over 500hp will feel insanely heavy... This is probably why most modern supercars nowadays are no longer offered in manual transmission anymore. Can be quite the problem for an ordinary person to control it. Now almost anyone can drive those new supercars. So much electronics and even the throttle response can be adjusted to make the car easier to handle... It is true that by doing so, it opens up a wider accessibility for people to own supercars but at the same time, a skill is no longer required anymore to master the control of these cars. That's why I always have a lot of respect to those who operate high power manual transmission cars as I know it is not that easy.