The original condenser is called a tube and fin style.
You need to get one that is called a Parallel Flow Condenser. Is capable of removing a much greater amount of heat.
It can be identified by large round vertical tanks on each end. These round tanks actually have many partitions, that move the refrigerant back and forth several times.
Even with a better condenser, it is still a good idea to include an electric fan to help circulate the air at low engine rpm.
