Came by this online. No idea if they are any good or the source of their parts, just sharing.
xatracing.com

XAT Built 3UR or 1URFE Short Block Engine 3URFE 3UR-FBE Motor Tundra
Our "standard" UR Toyota V8 build has no problem holding 800 HP, but we also have options to do well over 1000+ HP!!We also know the importance of being able to customize your build and have the flexibility to run exactly what your budget allows.Please note this does not include the core charge...
