How much torque can a GT6 gearbox take?

[Jensen pushes the button]

Hi all,

I'm planning a Spitfire build with a TR6 inline 6. I've been searching around for gearboxes and I've found a mk3 GT6 4-speed gearbox.

Will the GT6 gearbox be capable of handling the increased twist of the TR6 engine, especially with a little bit of tuning, I'm looking at roughly 180bhp from my final build, but I'm willing to cut that a little if need be.

Thanks.