426 max wedge ?

I don't think I'd turn it down...I wasn't aware 426 wedges were that common.

From what I've seen though, the pistons for them aren't the same availability as some of the better 440 versions...thankfully customs aren't as pricey as they used to be.

The 383 and 426 wedge both have 4.25" bore. Just different stroke 3.375" vs 3.75". Pistons can't be all that rare for that bore size.