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I would make sure the core is the problem. You may have a heater control valve that cuts off flow to the core by vac. or a blend door that cuts off air flow thru the core. You will need a shop manual to replace the core. The dash and console have to come out, along with discharging the ac.
Check bypass hose, on THE water valve to the heater core.The watervalve may not be returning the water back to the front of the engine the back of the heads are running too warm,it has to circulate in the bypass hose or through the heater core,common for chrysler v8,s .Bypass the watervalve completely to see if it runs cooler. If not,try to find a better radiator more cooling capacity!
HI, It may seem obvious, but sometimes overlooked.... have you checked the oil level, as low oil can cause some strange things to happen! My 96 4 liter would be reluctant to move sometimes, but after I topped it up, it has been fine.
Yes it's the heater core, It's a complicated diy job and unless you are an experienced mechanic you are going to need a good workshop manual for the job.
Here is a diagram of your fuse panel
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