47 Flathead Water Pump Swap Tricks?

[ford38v8]

Yes.
Before doing anything else, firmly tap the shaft several times while at idle speed, as debris can and does at times interfere with seals. To be clear, do this is a reprimand, not crushing destructive blows. If this is successful, you will see positive results immediately.
If unsuccessful, proceed:
You will of course need to support the engine with a short section of 2x6 on your floor jack, as the pumps secondary purpose is to provide motor mounts.
Start with Removing the fan belt.
Proceed by taking a measurement of the existing hose and beyond if it could be longer.
Remove the hose clamps.
Disconnect the motor mounts.
With caution, avoiding interference with the firewall, lift the engine enough to help break the hoses free, one at a time.
Remove hose and rubber motor mount, both to be replaced with new.
Remove the pump and clean the gasket surface and the radiator neck.
Put the new rubber motor mount in place.
Being mindful of the hassle it was to clean the gasket surface, use only grease to hold the new gasket in place.
Using a single long bolt with head cut off as a temporary stud, locate the new pump correctly and install, replacing the stud last. The bolt inside the pump can be stainless to prevent rust-out in the future.
Heat the new hose in hot water.
Using silicone on the inside of the hose, slide the hose all the way onto the new pump.
Position the hose clamps onto the hose now.
With the engine still in the raised position, The hose flexible from the heat, bend it toward the radiator outlet while lowering the engine, which will easily engage the hose onto the outlet.
Complete the motor mount installation.
Adjust the hose to midpoint between pump and outlet, and tighten the hoseclamps.
Fill with water, start and warm up the engine, retighten the hose clamps.
Open your third beer and enjoy. What? You forgot the first two?