I just put a leak less pump on mine last week. Got the fake bolts on there and the whole thing came out with no problem. RAY
I have one of these https://www.brattons.com/hood-prop-kit.html and it hold the hood up while I tilt the radiator forward to gain clearance.
I unscrewed the adjuster nuts to the maximum, so the rods were always supported at both ends. That was enough to get the pump in and out.