In 2017, I contributed $5,500 to a Roth IRA and recharacterized to Traditional with a gain of $1,120. If i convert the Traditional ($6,620) back to Roth, taxable/penalty?

I'll add that I'd be ineligible to take a deduction on the Traditional IRA contribution. Perhaps it's best to leave as a non-deductible Traditional IRA contribution. Just looking for some help. Thanks in advance!