AE82/ST150 efi tanks will fit directly but are very rare.
Your best bet would be to get an AE92/101/111 efi tank and modify it into your car. Not an easy job but experienced mechanics should be able to get it done. AE92 tank should require the least modifications. Using AE101/111 tank would allow you to use full aftermarket exhaust sets designed AE101/111 later on as well as it has the gutter for passage of exhaust pipe. Your pick.