Need top end advice

I already have a 340 in there now that ran high 11's low 12's , so I guess I don't want to build to go slower? I would build another 340 but unfortunately the community wants to hoard them then charge top dollar for them so I'm going the 360 stroker route.
I'm just curious.. if you already have a 340 why build a 360 stroker? the 340 i think will do 416" and you already have the block?