I need to qualify that there is a fair chance you could do a reasonably priced rebuild but you never know what you might find.
One of my engines had a broken rocker shaft, badly worn pistons and bores, pitted cam followers and a head that needed some welding. Some will advocate that all rocker shaft studs should be replaced with longer ones and the holes tapped full depth to reduce likelihood of the top of the castings breaking - which is what caused my rocker shaft to break.
Any significant corrosion on head studs and those affected should be replaced. Ensure all head nuts have good, thick, washers under them.
Another engine had a crack in one of the bearing caps. I was glad i had the block tested. I found a second hand replacement and had it line bored.
Another one had a crack in the water jacket where the oil /water heat exchanger ran on earlier engines. I had this stitched for a reasonable sum.
If your crank needs to be ground it will need re nitriding.
In short, you need to put in a few hours and get the parts thoroughly inspected before you know just how costly or not your rebuild will be.
Best of luck!
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