Honestly you should be fine.
Lenders are concerned with: Credit, which if you have clean credit history for 12 months there are definitely loan programs (without outrageous interest rates) available for you. Down payment, which if you qualify to use both grants, would be $12.5k down on a $100k sales price... or 12.5%, which is great, even on a $120k sales price, that would be 10% down, and again, you are looking good. 10% down or more speaks volumes. Debt-to-income ratio (DTI), which is taking your total monthly obligations (the $335/mo + the new mortgage payment) divided by your total gross income (which is $2,992 after your 5% raise, or $2,850 currently), assuming a 6.5% rate (which could very well be on the high side), $1k/year in property taxes, and $600/year in homeowners insurance, and mortgage insurance, on the $100k sales price the DTI is about 35%, easily fitting within every lenders guideline... on a $120k sales price it'd be around 40%, still looking pretty good, anything below 45% usually has no problem qualifying. Next are your reserves (assets), or the $1k you have... after the down payment & paying your closing costs, lenders generally like to see that you have 2 times your proposed housing payment, so $1k would be short of that. If you are able to save another $1k, in addition to any closing costs (which I'm sure the grants could pay for as well), then you should be looking pretty good.
I'd recommend you look for a "community" loan program, such as Fannie Mae's MyCommunity Mortgage or Freddie Mac's HomePossible, both allow using grants... whereas normal conforming loan programs do not. FHA also would permit you to use the grants, but it's credit requirements & DTI requirements are more strict than MyCommunity or HomePossible.
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