I didn't come in and read my grape notes. Big Problem???

I had everything written down on my desk but didn't come in and double check myself.
built my trellis 19' long and planted my 3 grapes (1 Concord, 2 Naigara) at 6 foot spacing not 8 foot like my notes said.
Since my poles are in 3 foot concrete filled holes I can't really move them and the plants are in the ground and watered in.
Am I screwed??? or will I be ok?

I think you can probably prune/train them and make it work. You just might have a bit more area on the ends where the vines are overlapping with each other as they grow but I don't think it'll be the end of the world.