You can fit turbo on 1G stratus . I got GT35R under my hood with few other toys. You'll need custom manifold and exhaust for that. If you'll use small turbo (T3) , you can fit it on some aftermarket manifolds. For something serious you'll got to go custom.
Trigger wheel on late PT/Gt block can be replaced with older ( custom ) wheel. I use GT block with custom wheel on my car.
Custum manifold will be last thing for you to worry about if you seriously trying to boost your car. Big turbo = new engine internals , and not Eagle and JE , something better and more expensive. Also, = new , better fuel system and fuel management system , bigger radiator , big IC , ignition control e.t.c.
You dont have to go with GT/SRT 4 block. New block maybe just 5% -10% better (crank oil squirters and head ports). If you going for something big , like 400+ hp ,you'll do your head anyway , so , with bigger oil pan and good internals you dont have to worry about squirters.
Also, GT block got crank sensor on the front of the block , not on the back as on older block , and , it rite under starter and front engine mount ,so you'll have to modify your front mount and shave off some metall from the block to fit your old sensor properly. Without proper fit you'll have no power for the fuel pump , injectors and ignition. Entire ECU depends on crank signal.
Have fun.
You dont want to know how long and how much money it took me to make 500+ whp.

If you need custom intake manifold , let me know , I got my older manifold for sale. Also , old 2.4L engine with just 37 000 ml on it ( pulled it out of my car back in 2001 when swapped for my first turbo engine ) , and , new set of SRT4 lifters.