If it's anything like a 63 Valiant you would need to remove the entire dash to get at the nuts on the inside of the dash, or small tiny hands, which I don't have This means the windsheild needs to be removed to get at the bolts that hold the dash to the body then you should have 1 bolt on the bottom on each side at the kick panel area. Someone else may have another way so maybe they will chime in.
Dont have a 63 but on my 66 I got to everything after I took out all the gauges, speedo ,glove box, etc. On mine there were I think 6 maybe 8 nuts.Did not have to take out windshield tho.
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This means the windsheild needs to be removed to get at the bolts that hold the dash to the body then you should have 1 bolt on the bottom on each side at the kick panel area. Someone else may have another way so maybe they will chime in. 
