318/8 Speed Swap

The 70 in 8HP70 means it's rated for a max input torque of 700 Nm (516 lb-ft). That number is a little misleading because of the torque converter, spikes during shifts, etc., but can be used as a guideline. There are plenty of 5.7/6.4 Hemis out there putting way more power than that through a stock 8HP70.