I would think if the "big" radiator is dimentionally the same as a"little" truck, you could put a performance "little" truck radiator in with out any problems. The stocker in my '48 4400 cools my 350 just fine.
good luck-Scott

Scott Ward

2 1948 1.5-ton Loadmasters
The red one and The snow pusher
1 1950 3100
1 1955.1 Chevy 6500
1 1954 Chevy 6500 2-Ton
1 1955 1st Series COE 5700
1 1963 K20 (454)
1 1964 C10 (350)
1 1951 1.5-ton Dump Truck
1953 and a 1956 Ford F800

Raising a teenager is like trying to nail Jello to a tree!