Yours is certainly a clean install. The SBF just sits so differently, mount wise, than a SBC. But sitting the steering box on top of the frame seems to be where I'm leaning, as yours is. The length of the setback, for the fan position has been figured and why the engine is sitting where it is in the pictures. But nothing is welded yet, so easily moved. Do you have a radiator suggestion? I'm thinking that should be next, then I can finalize the engine position.