We have a clergy housing allowance, too. Oldest was selected for verification twice, youngest hasn’t been elected at all yet. First time, we had to send copies of the 1040, second time just use the DRT. The school will tell you what to do. As long as you included the untaxed income, I doubt anything would be found that increased you EFC.
What I always have trouble with is the question about income earned fom work. Obviously, I don’t include the housing allowance, but our totals never add up to the AGI because of the self employment adjustment, capital gains income/losses, etc.