If your husband is claiming injured spouse, then it is suggested to allocate any tax credits on the Form 8379 to the spouse with the most income. It is also suggested to think in the mindset of a married filing separately return. The question will arise as to who would claim the children as dependents to be able to take the applicable tax credits.
If your husband does not qualify for the child tax credit, he cannot take the additional child tax credit. Therefore, an allocation for the additional child tax credit should not be given to him.
If you are in a community property state, then any deductions, credits, etc. should be divided 50/50. However, the allocation of any estimated tax payments can be decided between both spouses.
The Earned Income Tax Credit (EITC) is never shown as an allocation on the Form 8379. The Internal Revenue Service will determine the amount for each spouse.