a few austarion members swapped out the stock 2.0 for the 2.4. Head flow better. Use the 2.0 mechanical valvetrain
Keep it all 2.4. Compression perfect for street turbo
A few hot starion 2.6 prefer those beehive springs. Verify installed heights same as yours(most likely they are)
Street starions made 400hp on stock mech cam (from caravan, Kcar or truck). 2.0 duration should be similar
I'd just:
1.get a good running 2.4 first
2. decide what u route u gonna go for tuning and install the goodies
then 3. turbocharge. Add the cam lastly as a single mod so u could evaluate its affectiveness