VA doesn't specifically have any credit score requirements, however, you'll find most lenders are requiring a 620+ middle credit score. If there is a lender still underwriting to the true VA standards, it's probably going to be USAA, since VA is pretty much all they do; you might want to try them out. Also, there won't be any problem with you keeping the owner financed property, as long as you can still qualify for both homes under your specific circumstances.

In the current lending environment, 620 would be the standard.

Freedom Mortgage is a Direct Lender of VA loans and require a 620.