You're right, you probably can't return it, so you'll have to eat the cost and buy an appropriate sized gasket. From what I've read, these engines are quite picky about combustion chamber size, so if you run your current gasket you're setting yourself up for failure.
You have opinions/experiences from knowledgeable Supra community members (see thread referenced earlier), and they're saying the build you're proposing is far from ideal. To me, it's a no-brainer; spend the couple hundred bucks now so you don't have to spend the couple thousand later.
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1989 7MGTE R154 Targa Top White Package w/Blue Interior
Driftmotion 57trim CT26, Upgraded Intercooler, 2.25" Hard Pipes, 3" Turbo Back Exhaust with Test Pipe, HKS VPC w/GM 3 bar MAP sensor, APEXi S-AFC, Walbro 255lph fuel pump, ProSport EVO Series Boost / Fuel Pressure / AFR gauges, Lotek a Pillar Gauge Pod, HKS Type 0 Turbo Timer, Eibach Lowering Springs, Tokico Illumina II TEMS struts, custom powder coated Motegi Racing TrakLite wheels
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