Your gun in the way makes it hard to id. I suspect 450 or 350/360 .
They have crossover tubes . On this one there appears to be one welded over ,and the second one, well gun is in the way.
Without crossover , you any be leaning it over a few times when into reserve.
The 450 CB tanks , are like ssmaller version of tge 750 tank, and look good on them, shows more motor.