Silly question... I'm quite new to ignitions in general, but I'm swapping my coil because it quite literally melted(due to stripped wire grounding I found recently). The car's a 260 with an l28 swap from a 280zx and it has an MSD blaster 2 that i'm replacing. So, now to the question.

Is the capacitor that's currently connected to the coil really nescessary any more since its no longer running a points based dizzy?

If the distributor is now electronic and no longer a points type then the original points capacitor is redundant.

... well, except for noise suppression. If your tach is like a 280's, a noise suppression cap might be easier on it. I think if it's like the 240's tach, it might not make much difference. You also might get more radio/stereo noise without it.