Large or small, improved handling comes down to weight distribution and setting up roll couple to support that distribution and traction to translate it to the tarmac.

Can a C body be reasonably handling cruiser, absolutely. The basic formula for any of our cars isn't that different irregardless of the platform; stabilize the body with connectors and bracing, step up spring and/or anti-roll rates, control it with shocks, get decent rubber under it.

Most of that can be accomplished in a manner that will not detract from its classic looks. Tires is the only area it gets dicey, but if you are building a C body, UHP handling tires probably aren't going to be required anyway. The MT SR is an H speed rated, soft compound tire and the Maxxis is an H speed rated mid compound tire that will both match reasonably well to a classic with a vintage look and improved touring capability over your basic BFG or Cooper choices.