Many do it. You will have to reinforce the wall to the engine bay. Some have used it and cracked fiberglass. You should really go to the supra owner forum and ask.
Personally, I used the sku pylon, and put another 450 ontop of the sundeck and had a 750 flyhigh in the rear compartment.
I don't know how your 22V was plumbed, but going to more stupid Supra design, they put the vent tube at the rear of the sack just above the fill, and it can develop a lot of air and cause issues with overfilling. So you need to monitor a large bag closely if you are going to use it.