Best 340 stroker kit?

muscle motor..hughes ...mancini makes no parts for a stroker ...they rebox parts...

Scat makes a kit with Scat cranks...scat rods..and KB pistons...

Scat kit can be bought from many distributors....mancini...hughes..muscle motors..summit..and so on..

You can have a distributor put a kit together for you....and change out cranks pistons rods...rings... bearing...