Keep the faith mate, you know how much you enjoy it
Pushrod tubes are an easy fix
Get a GOOD spring loaded set, there's plenty of Chinese junk ones available. New seals.
Jack up one side to move oil across, rockers off, take out push rods keeping them in the right order for refitting. Break out all the old tubes with a mole grip and brute force
Oil the rubber sealing rings before fitting Fit new ones with the seals and locate one end then I found putting a piece of tin over the hole in the block you can compress the spring and slide it over the tin to line it up and ease the tin out
Good luck
Dave