Wow
Zipper, a 1250 with dual hydraulics, great deal! Looks like you’re getting’ it cleaned up nice.
If the oil pan threads are sloppy you can helicoil it like this;
http://www.onlycubcadets.net/forum/s...&postcount=168
But if its damaged from rubbing on the frame rails you might look for a cast pan to replace it.
Oil pan gasket part # 235353-S
Pull the head and plane like others have said. Check out
olds45512 video on that;
http://www.onlycubcadets.net/forum/s...95&postcount=1
De carbon the head, piston top, valves and lifter galley;
http://www.onlycubcadets.net/forum/s...223#post338223
head gasket, stock, 10 - 14 HP (part # KH-47-041-15-S)
Rebuild the carb;
http://mgonitzke.net16.net/tools/carb_rebuild.pdf
carb rebuild kit (part # 25 757 02-S)
Check the ball bushings at the engine drive coupling and at the transmission input yoke to see how much play there is in relation to the drive shaft ends. If either is to sloppy you may need to replace them and or you driveshaft.
Jeff in PA can set you up with the solid motor mounts, drive shaft and the ball bushings if you need.
Get a set of new Points Kohler (part # 47 150 03-S)
And set the timing using the static method;
http://mgonitzke.net16.net/tools/static_timing.pdf
Make a steering wheel puller;
http://www.onlycubcadets.net/forum/s...647#post362647
And upgrade your steering;
http://www.onlycubcadets.net/forum/s...639#post361639
Sorry, that's all I got for now..
Have fun! (drywall sucks)