The Most Powerful Small Block Mopar..??

Friends, we are building a small block (R3 block, W9 heads, etc.) to run here in Brazil. We will compete with Fords and Chevys! The question is: What is the most powerful small block mopar that you guys have seen? Recalling that the displacement is limited in 420 CID! Actually, we need an engine of about 1000 horsepower's, just burning methanol..!! It's impossible or not..??