I was wondering if my 2.4L OHC engine is able to take a 50hp shot of nitrous? Are the pistons gonna hold?

Yes it will be fine...you need to follow the instructions and retard the timing the amount it says. The best way to do this is to buy a Mallory ignition box that automatically retards timing when you run nitrous. I think MSD also makes something similar....

the 2.2 liter can handle a 75 shot so i'd assume the 2.4 could as well...