There is a d20 Pulp Hero game out called "Forbidden Kingdoms," but I don't know the publisher off the top of my head. Indiana Jones would fit right in there.
Actually MSPE was made by Blade/Flying Buffalo..the people who brought you Tunnels & Trolls. At the time, Espionage from HERO had just made it's way to the market and Blade and HERO produced a few cross-stat products.
I ran both games (and later HERO's Justice, Inc. Pulp game) so many years ago after I kind of gave up on AD&D in the early 80's.