By Kyle Wood Spread, over/under and prop bets for Tuesday’s Celtics-Heat game in Miami. The Heat are small home favorites. The fourth and final regular-season meeting between the Celtics and Heat tips off Tuesday in South Florida. Boston beat Miami in seven games in the Eastern Conference finals last May and leads the regular-season series, 2–1. The last time these teams played it was a two-game set at the TD Garden on Nov. 30 and Dec. 2—the Celtics won the first game, 134-121, and the Heat won the second in overtime, 120-116. Miami won its most recent game, 100-96, against the Pelicans on Sun…