I have been reading up on US elections of 1936 and 1940 but cant find any information on the following. What were republican stances in 1936 and 1940 as opposed to Democrats in US on economy, war in Europe and Asia, their stance on intervention/issolation?
I'd suggest going over to the American Presidency Project. There, you will find platforms for both parties.
Republican Party Platforms: "Republican Party Platform of 1936," June 9, 1936. Online by Gerhard Peters and John T. Woolley, The American Presidency Project. http://www.presidency.ucsb.edu/ws/?pid=29639.