^ That would help. Immensely.
I was also thinking that post-war, Argentina (which is not damaged by the war) contributes to the Marshal Plan under US contracts. This gives technology and money to the Argentinians. And yes, political instability, particularly post-WWII, caused much of the economic problems.
But with Peron out of the picture - and as such, likely his supporters too - that instability dies away largely. A 1st world, democratic Argentina would be a model country to base much of Latin America off of - and all that capital that Argentine citizens hold in foreign accounts ($125 Billion+) would stay in Argentina, not to mention probably some of that from other Latin American nations.