Advice on Honda Turbo and engine?

i have a 95 prelude with a 92 h22a vtec. now, the engine has 158000 miles on it, i want to change valves, pistons, manifold, rods, cam gears and other internals because i want to get a turbo, but i want my engine to be right then to blow it. now, being at the high milage that the engine is at, is it worht it to put all these new internal parts in or just get a new engine period and then put them on?