What other frame can you put under your 1956 Chevy pickup.?

You can consider using a modern chassis from a Chevrolet S-10 or a similar mid-size truck, which can provide a better ride and more contemporary suspension geometry. Another option is to use a custom-built frame designed specifically for classic trucks, which can allow for improved handling and the integration of modern drivetrain components. Additionally, a chassis from a vintage Chevy pickup from the 1970s could be a viable option, as it may fit well with the classic aesthetic while offering updated performance.