Lowest cost 400 stroker

Lowest cost stroker 426 ci. would be offset grinding a 383 crank to bbc rod journals, use a 6.70 connecting rod & 1.485 compression height Pistons from 440 source That would put your piston .015 under deck & leave it
If you wanted to step up to a bigger cubic inch later add a 3.915 stroke crank to make a 470.
Just a thought, or offset a 440 crank to bbc and same rod, just use a 1.32 ch piston