426 inch+ small blocks

I know of a 10.0 street driven Cuda around town with a 465" stroker. I spoke with the owner but it was awhile back. IIRC it has 4 3/16" stroke crank. What concerns me is the step up in $$$$. He said he spent $25k on the engine w/custom crank,pan,everything. This was built at least 5 years ago so maybe the crank and pistons are readily available now but I haven't seen them.