The record level of spending in Gov. Phil Murphy’s budget proposal cannot be sustained by tax dollars in the long-run, New Jersey’s nonpartisan budget analysts warned Monday. Thomas Koenig, budget and finance officer for the Office of Legislative Services, told lawmakers the governor’s $48.9 billion spending plan meets the constitutional requirement of a balanced budget. But, he added, it relies on a historically high surplus accumulated during the pandemic, even though the state is taking in record tax revenues. “A budget that relies on $1.7 billion in surplus to be balanced is not sustainabl…