Discussion about the arduino based g-code interpreter, grbl
Grbl v0.9 has a 79 (80-1) character limit. This should cover just about all cases of input that Grbl supports. This 50 or 70 line limit is artificially constrained by your version of UGS. Older ones limited it to 50, because Grbl at the time could only support 50 character. The same for 70. You'll need to update your UGS version, and if you still see a 70 character limit, please ask the UGS or whatever GUI's administrators to update their code.
Thanks for the info I found the settings to increase the line length. I can't believe I could not find that it was right in front of my face haha. I am using PCB_Gcode in Eagle which works pretty well. I just made the first circuit today!