I had asked this question and it was suggested that I use plain TeX.
On TeXworks among the compiling options there is no such thing.
When I try running the file through pdfTeX I get the message,
This is pdfTeX, Version 3.1415926-2.3-1.40.12 (MiKTeX 2.9) entering extended mode (C:\Users(some path)\MiKTeX\2.9\tex\plain\harvmac\harvmac.tex big or little (b/l)?
What am I supposed to do?