A nitrous 318
When I called nitrous express for my system they said "any production v8 can handle 150hp" They gave some recommendations for a base tune I.e timing to pull and sparkplug ranges and plug gap. He emphasized those were base line, conservative recommendations. He also recommended running their s.a.f.e. fuel system with race gas in it. He said this would allow me not be as conservative with the plugs and timing.
For my setup he told me 250hp was the limit for my setup.