Duster 383 cooling issue

Garrett Ellison said

Copper core plugs and what heat range? Timing settings and how much total and vacuum advance? Make sure you are running ported vacuum advance. Does it feel like it is running as strong as it should? I noticed the words stroked, how many cubes?

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Copper core don’t remember temp, timing is set at 12 degrees 32total and yes on vacuum. It is 488ci and no it felt like it ran stronger this winter then it does now I blew the trans and had it rebuilt and now that summer is here it is having the cooling issues.