Heat Riser 225 slant six

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This is what my empty heat riser space looks like. I’ve tried a heat riser off a 175 and a few other slant sixes. Regretfully, none of the ones I have fit this vehicle’s setup.

I’m at the point where I’m considering a choke pull cable but, am hoping to keep things original to the car.

You don't need a heat riser. You need the choke mechanism.