Keeps overheating, the radiator is new, I changed the thermostat

It sounds like you replaced everything. Are you sure it is overheating or could it just be a false reading on the temp gauge? Also, have you checked it for a bad head gasket?

I am concerned that it was squirting coolant. When the T-stat opens, you should see it flowing through the radiator. It could change level in the radiator and some spill out, but I've never seen it squirt out unless the radiator was under pressure and then you removed the cap. Something is telling me compressed air is getting into the radiator via a bad head gasket. As far as the hoses getting hot, yes the top one will usually be hotter than the lower one. But, they both normally will get hot.

Coolant from the muffler is not good. Now I am confident it is a head gasket. It is a major job on any vehicle. As far as gaskets, you will be removing more than just the head gasket so when you get the gaskets, usually they come as a kit. As far as cost, I don't know where you live or the average labor cost per hour, so that makes it hard to estimate. In my area, PA, I would estimate that the cost would be around 4 to 500.00 to do the job. According to my manual, it calls for 6 hours labor to remove and replace the head gasket. So, take that times the labor cost to let you know how much you will have in labor alone. Then get a price on the parts cost.

If you need any help, let me know. I will do my best. Also, as a consumer of used vehicles, I thank you for trying to repair it before you sell it. At least you will be able to sleep at night. Plus, you will feel comfortable asking more for it since it will be repaired.

The kit that you mention is most likely needed because to access the head gasket, there are many other things that come apart which require new gaskets.