I got an 83 mx63 that i just did the suspension on....i also been through alot of parts interchange stuff with supras and later cressidas (x73's) our cars (mx63) are oddballs but i can tell you exactly what will work and what wont....
Front Suspension: Techno Toy Tuning Coilovers and Camber Plates for MX73 900kg on the spring rate, cut and sectioned strut/spindle tube to fit sw20 rear kyb agx...this is known in the supra comunity as the Wes Hetrick trick....
For the Rear i tried the 84 supra rear springs and it raised the car

i guess this works on mx73 but not for us, remember oddballs

i have springs on order from 935 motorsports but the dude is a asshat and pretty much has not responded to me in months...
so for now i rock slightly cut springs...
i may have a solution for this problem but i have not tried it...order custom circle track springs

you can get them in any size and spring rate..i beleave we need 5.5" Wide Spring, 11" Free Length 250lb to 300lb
rear shocks are again part of the Wes Hetrick trick Rear agx's from a ford focus....
i have more for you just hold tight i will be on later tonight

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MX63 5-speed, factory lsd...