I would think that truck already has a decent size radiator.
I had a new core put in my stock '37 radiator. It lasted about 4 years before starting to leak again. I had it repaired once, then I started repairing it. About once a year it came out for a seep here and there. Turned out, the top tank was so thin, every heat cycle it would expand out and over time crack the solder joints. There was no fix for it so I replaced it with an aluminum street rod radiator. No more problems, and since the core was bigger and I had to reroute the lower hose, the cooling system now hold about 1 gallon more then before.
joe
Joe
