boxing plates

[1929]

My friend keeps telling me to box the frame of my 1929 coupe, he thinks its proper since I have the whole car apart, to make it a stronger frame even though iam not changing the stock engine. Many tell me I shouldn't do it cause Iam not changing the engine, but he thinks I should even if some modification to the engine will create higher speeds. Should I box the frame or don't waste my time and money???