I agree with a turbo setup,requires some fab work but well worth it and can stay under or at budget.
A magnum swap is a good direction,will need some work,computer work or induction/electronics,can stay around budget limit.
A pair of closed chambered heads,1.88/1.60 valves,some head work,thin head gaskets,convertor and gears,headers,advance the cam,it will stay under budget also.