ECP 26" Aluminum Small Block Mopar Radiator - Big Cooling Tub
This! I have one. Cools VERY well with a 190 t-stat. Direct fit, perfect, in my iron head Duster 340.
$350!
I use a Hayden Clutch:
CHRYSLER Hayden Automotive 2947 Hayden Fan Clutches | Summit Racing
340 in stock spool mount location, ECP 26” radiator, and the low profile Hayden high performance clutch fan. You can’t make this car run hot.