SD cars can take significant engine mods, and they respond very well to them when tuned properly. Usually most tuning just involves finding the proper fuel pressure with an adjustable fuel pressure regulator. Keeping the car in tune, would, I suspect be very important as well in regards to maintenance.
88workcar is one of the resident SD guru's on the Mustangworks. He's running aluminum heads, an E cam, and an intake. All told he runs low 12's N/A, and should be well in the 11's with his NOS shot.
Some people seem to have more problems adjusting their SD cars than others, I really don't know what to say about that, I'm just thinking something may have been out of tune.
Anyway SD can handle heads, cams, and intake. It seems to be really pressed if the combo gets over the mild stage though.
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