How exactly does a turbo app stress a timing belt more than an NA set-up other than potentially higher underhood temps?
I’ve had/dealt with a number of NA set-ups revving to 9000+ with agressive cams with zero problems with OEM timing belts.
Measure the stock gasket. I’ve seen them work just fine for a high compression high revving 81.25 mm setup (ctr oem oversized pistons).