Duster overheats with 26“ Radiator

Have a 318 mostly modified with matching Edelbrock parts.
The past years I got a three row aluminum radiator installed. Never got over 180 (mechanical fan and two overpowerd electric fans as pusher - second one never runs).

Lately I installed the original 26“ radiator with shroud and overflow bottle. It looks so much better but now it goes up to 230 (both electric fans running).

So obviously it’s the 26“ rad but that thing should cool down a 340 without electrical fans.
Is it a bottleneck in the cooling system or should it work fine?
16lbs radiator cap is new.

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