Hemi Swapping a perfectly good 70 Duster

It runs! My gates heat shrink hose clamps didn’t show up so I could run it for very long. I put 2 gallons of coolant in it and it still isn’t even up to the water pump. That was enough for me to run a couple minutes.
That single big throttle body sure makes throttle response snappy. It’s pretty damn loud with open headers too.

For the engine gurus, I put the high pressure spring in the oil pump. It has over 100psi oil pressure when running. Is that bad?