Hold up, last I knew 426 was the max you could go with a 383? (which brought much more appeal, for me, to the effectively small block 383) Who has a kit for this? Or is it a piecemeal operation?
If I was going to build a 383 stroker I'd do a 451
3.915 stroke (2.200 journals) 6.700 rods & 1.32 flat tops, 4.280 bore. Dress it up like a sticker.
Use stealth heads, painted engine color.