1984 300 turbo WVO 2 tank conversion

I am converting a 1984 300 turbo to run on wvo using a seperate tank, hose in hose approach. We converted my brother's 1986 sdl already (so we have a clue). I just (15 minutes ago) bought the SVO/WVO advanced theory so it has not arrived.

MY QUESTION: Where do I cut the heater hose? right after the thermostat? on the top left hand side of engine (as I face the engine)? I am guessing that if I cut there then any flow controls for heat need not be on in order to supply heat for 2nd tank (good idea when its hot outside).

Thanks

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