speed density question..

[bobtodd]

I was just wondering how well speed density cars handle aftermarket heads, cams, etc. I use to own an 88 gt which was speed density and after adding a supercharger to it, the car would surge really bad whenever I got on it. I have since sold that car, but am looking at an 87 lx today, and was wondering if anyone has had problems adding different mods to their speed density cars. I guess I could always convert to mass air, but it was expensive when I did it to my gt. Anyhow, any info would be great.