IIRC, Grainger carries the hoses and fittings for sending vehicle exhaust outside. If I were to install a system like that, I think I would add a small fan to ensure that the exhaust went outside. I think I've seen small ducted fan motors that would do the job. You can probably find threads on this in the Garage Journal.
Edit: Turns out Grainger is plenty expensive. The link below is for a place that is much cheaper. It's good for ideas, if nothing else.
1978 FJ40 mostly stock
1976 FJ40, 5.7l Vortec, NV4500, Orion
1976 FJ40 being brought back to life (slowly