do i need to chang speed density to mass air

[Unit 5302]

Jeff, if this was the racetrack, I'd bow to you on the wisdom. This isn't the racetrack and members of this site have run the combo. I've personally seen 24lb/hr injectors run on a 306 block 1987 Mustang GT T-Top car that was otherwise stock for over 2years. If I hadn't had first hand knowledge, I wouldn't have said it.

By the way, you need to do more research on speed density systems or real world tuning with injector swaps between SD and MAF systems in order to quote what will and will not work. I know you don't have first hand knowledge of this, otherwise you wouldn't be quoting what you were. Anyway, I'm not saying that the overall application of speed density can handle more modifications than a MAF car. That's ludicrious as there are finite limits as to the SD tables. That being said, the tables themselves are far more adaptable than the MAF tables. There is no MAF equipped 5.0 that would be drivable using 24lb/hr injectors without being calibrated for them, period. I've seen speed density handle it, like I said, first hand for over 2 years. The only problem my friend had was with idle surge which required him to reset the computer about once a month and it would clear up.

I don't know what would happen if you slapped 24lb/hr injectors onto an SD engine with a cam.