well the h23a seems to be a really good engine to get. my friend droped one in his 95 lude and he whoops anyone( well almost). if you want to get the h23a you should get it through www.japandomesticmotor.com it has a 750$ differance than the nagano site. but they will most likely not have any in stock. they are really rare. i orderd one and its been 4months and they said it will arive in about two more weeks. and i wouldnt turbo anything unless you totaly rebuild the internals. new rods, pistons, balance and blueprint and shave the crank and a lot of other stuff. so judge on wich one will be better bang for buck.