Overheating issues with remanufactured 360

Hey guys its been a while since I've been on the forum. I have a 72 Dart Swinger and when i bought it it had a 318 and it blew so i bought a re manufactured 360 from O'reileys.
We've been having overheating issues with it for a while and are trying to troubleshoot it.

The engine has:

Big Thumper hydrolic cam with a Duration: 283/303 Lift: 513/498
Dual core aluminum radiator with custom fan shroud with 2 high puller 10" fans
We've had the heads redone several times they are stock 360 heads (were on the 318)
It also has a stall converter3400


we were thinking of maybe putting the stock torque converter in it and putting a milder cam to see if that helps at all.

If you have any other questions i can answer them, i would love to find out the problem if anyone has some input.

Thanks,
Travis