If Howard can average 22 points on 57% shooting, and have a 4 games averaging 27.8 points on 65.5% shooting against arguably the best people in the NBA to defend him, I think the only thing Dexter Pittman will have to say to Howard is "dear god, please stop"
With that being said, I'm fairly certain if it came down to Orlando vs. Miami, the biggest factor would be Howard's passing out of double teams and the 3pt shooting. I'm almost sure Miami would double Howard on nearly every possession and make him give it up so that Orlando would be dependent on 3pt shooting. Howard would probably average around 20 points a game, maybe more if they decide to give him room, but I doubt it. Offensively, I think it'll be a LOT like how it was when the Magic went against the Bobcats.
They decided to completely shut Howard out offensively, but got burned by Nelson/Rashard. The only difference here is that Miami's offense is MUCH better than that of the Bobkitties, so it would definitely be a long series.