mopars in the rain

So I'm new to mopars and the a-body. i've been told by a few people now that i will have issues driving this car in the rain. i did search, can't find anything specifically on drivability issues while in the rain. is there merit to this comment? and if so how can i prevent any issues? i haven't really driven it in the rain just yet but i did move it around the street from spot to spot and i thought about it afterwards....it was actually stumbling more than normal. it does always have a bit of a miss, i've read that a more powerful coil might help. but what's the deal with this rain issue/nonissue?
thanks
vern