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Custom manufacturers can build almost whatever you want, but it's probably safe to say that standard catalog offerings are at an all-time high. Even somewhat obscure combinations are available off the shelf, such as this Probe piston for a 390 FE running a 428 crank. This was actually a pedestrian Mercury-only combo in the mid '60s, yielding 410 cubic inches. Probe's part number 14472 is for a 0.030 over 390, resulting in 416 cubes with a 3.98 stroke. It features a modern 1/16-inch, 1/16-inch, 3/16-inch ring pack, and forged 2618 construction.