Stroking a 318 to a 390

Been searching the internet trying to see what is available for narrow main bearing for 318/340 main bearing size...actually trying to see if anyone has a set on sale...lol

Going to order a set of king xp series main bearings mb 558xp standard size from Summit...with my discount they got same price as most everyone else plus they will be here on Tuesday.....I need a few other small things to add to the order and get the free shipping...
Not going to quit ...just got frustrated Saturday........so mowed the grass today....and have new gas power weed eater...that it alot of fun