The M1 can is all metal so no worries about that one. The other can won't be plastic either, but I haven't received it yet.
I have another idea for my shed that is a little crazy. It consists of an intake manifold (with carb, air filter and distributor), valve covers, spark plugs, wires (or hoses that look like wires), and LEDs in the spark plug boots that will light in the order of a SBC firing order.