There is plenty of room to put a turbo an intercooler (if you don't run AC). At first, I had AC and mounted a small intercooler under the radiator but then realized I didn't drive the truck when it was hot. So I removed the condensor and AC and put a big IC in the front.
If you are going to do a stroker, use a 360 based because the bore size of the 318 makes it hard to find a good piston with the ring low enough and then a good ring for that bore.
Just get a set of stainless shorty headers and flip them side to side. You will have to make a 5/16" plate to move the PS pump up and out a bit because the shorty header outlet will hit the stock location.
What are your power goals? street? etc?