Gap shooters hold the bow at full draw for long enough to place the point of the arrow on some predetermined point. Because of this requirement to hold the bow at full draw, you should be sure to get a bow you can comfortably hold at full draw. It doesn't matter whether it is a longbow or recurve, cut to center or not.
In a tournament, you may need to shoot 50-100 arrows accurately, whereas in hunting you only need to shoot one arrow accurately, so there are obvious differences in what "holding comfortably at full draw" means, depending on what activity you plan to do.
In general, people can shoot a longer bow more accurately than a shorter bow, regardless of your aiming method. So unless your hunting needs require a shorter bow, I recommend you go with a longbow of 64" or longer, or a recurve of 60" or longer.