Cam Choice

Hey everyone I am a new member and I wanted to say Hi before I ask a question. I'm looking to replace the Cam in my GT. First I wanted to Keep the Factory heads for now and factory intake for now. I wanted to start with the Cam and work my way out as money allows. (New Baby in the house) Right now I have a H-Pipe, American thunder Flows and Ford Racing shirties on the vehicle with 3:55 gears in the rear. I wanted to get a E303 or B303 cam but read Horror stores on them that sometimes they can never set the stall at lights. Im trying to get that sound out the car thats hard to explain kinad of like that old muscle car sound I guess it sounds like a erratic idle. I called the three cam companies and I was wondering if anyone has any info on these:
Comp Cam - 35-324-8, Lunati - 51014LUN, Crane Cams - 444221. I was told that the problem wit the E303 was that the Lobe seperation was cut on a 110 but all these are cut on a 112? One comapny said to change the rockers (Because the factory rockers are supposed to be 1.6 but actually 1.45) to 1.6 the other two said that the factory rockers are indeed 1.6. Any help would be great...

Here is two youtube videos of the sound Im trying to get to.

YouTube - 1989 Mustang 5.0 Stock with E303 camshaft

YouTube - acballa3369's Channel

Thanks for the info so far. I read some thread and they said change the valve springs? Yes? What else is worthy of changing?

I was looking at the CJpony parts and they have Trick Flow Lits what one would be more fitting for me the "350 HP" or "360 HP" set up? I know its 10 HP but what else is really the difference?