I've been wondering the same thing. How about heads, injectors and such? Is it just the cam swap that SD people need to be concerned with? I have also seen talk of SD friendly cams but no real specifics.
ya speed density cars are just more sensitive to cams, there are a few speed density cams, no problems with heads and injectors, use the right cam and you will have no problems.
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1988 mustang 5.0 LX, Edelbrock performer manifold, mac headers, off road H with high flow cats welded in, AC/smog eliminator, frpp 9mm wires, bbk CAI, msd cap and rotor, Flowmasters dumped, steeda tri ax, 3.73 gears, and mickey thompson DR's 13.91@101
1983 pontiac grand prix, weekend car, 355sbc 11.5.1, world heads, forged internals, th-400 with transgo shift kit, 8.5 rear with 4.56's and auburn posi unit, 11.96@115 on et streets. (SOLD)
Improving the air flow, is no problem. This means heads, intake, exhaust, typical bolt ons. If you change the air pumping characteristics, then you'll have a car with an attitude. This means aggressive cams aren't speed density friendly.
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Speed Density Mods?? 
