A weekend , well that depends on what you have on the car and how much power you want , best if you got a engine ready to go to drop in, a weekend is possible , other things that take time to hook up if you have them, like power steering , A/C compressor and mounts, if your looking for more power you can do a easy up grade, find a Murkur Scorpio with the 2.9.and use your oil pan and engine mounts on it, yes it will bolt to your org transmission, as is it 40 hp more than the 2.8, you have add more if you can get the overseas computer up to 160 like it is, the intake will clear the hood , the Ranger/Bronco II will not, also you do not have to set the valve lash , it's hyd , these engine with care ,oil changes , and coolent maintenance will run over 300K , and one that surpassed that in a bronco II, and if you can grab the trans also , a great mod for mpg and quiet on the hwy , later Blaine