The spec is 78 ft lbs when using moly grease. ARP has updated their specs and now specify a higher torque than that. You generally want to use 30 weight oil when lubricating fasteners. I recommend against using a variable viscosity lubricant for critical fasteners.
Swapping in a 2JZ will cost a lot more than swapping in a 7M-GTE and upgrading it for a mere 400RWHP. The 2JZ is cheaper to get 400RWHP out of IF it's already in the car.
The 2JZ is more reliable but the 7M can be quite reliable if shortcuts aren't taken and the person doing the work pays close attention to the details. A 7M refreshed to stock conditions, using stock parts can manage 400RWHP pretty reliably. I'd upgrade a few things while the engine was out, naturally, but it doesn't have to be a monster build.