I can’t begin to provide a answer to this. There are to many variables. Year of manufactore, type of ignition , type of control, left or right control,all fall into the mix.here is the parts book.
http://download.partstown.com/is-bin/intershop.static/WFS/Reedy-PartsTown-Site/-/en_US/manuals/BL-DFG-100_pm.pdf
If you preffer, this is a interactive link;
http://www.partstown.com/is-bin/INTERSHOP.enfinity/WFS/Reedy-PartsTown-Site/en_US/-/USD/ViewStaticPage-LoadManual?CategoryID=EYazIDRCslBLPeltYXpbKcTSCT
Basically, the regulator, pilot and burner orifices will need to be replaced. I highly recommend you find a tech that works with gas and has the calibration tools to do this. If still hot surface ignition, you may want to convert it to direct spark/ pilot.