7MGTE has problems.
5MGE turbo'd is better
dont forget to torque the headpast FSM recommendations!
if you want a Toyota L6, why not a 1G-GE? Cheap as fuck at the importers.
1G > 7M/5M by far.
Though if your chasing big power, you're better off with a more modern motor. 1JZ non-VVTi with single turbo conversion is your best bet.