Knowledge needed grand prix

Potential challenge car.

Ive bought a 1999 grand prix with a built motor and speed parts but bad trailing arm mounts.

I just went and looked at a 1997 grand am circle car with a full cage and a bad trans. Comes with a quad4 motor, needs some rust repair in the floor and the rockers are gone but the trailing arm mounts look solid.

If i read everything right i can drop the cradle and swap the motor and trans/struts ect all in one go?

Are the quad4 and 3800 harness and ECM anything close to each other? I can of course pull the whole harness from the grand prix,

But it sure would be easier if the harness and PCM were compatible with a few changes?

Also... This car has a cage that goes all the way to a loop that runs through tbe fender and up all the way around the radiator saddle and back all the way to the bumpers. Do you think i could just run a couple new bars down to the trailing arm mounts?

Any help appreciated!

Harness and ecm are radically different. 

Need pictures of the cage.

Whats the end goal?

[URL=https://beta.photobucket.com/u/rbates74/p/45c1e4e7-b4a6-4b5f-adc6-3cd806db3d5c][/URL]

[URL=https://beta.photobucket.com/u/rbates74/p/78dabc5d-f31f-4143-924a-44c06163d20c][/URL]

Goal is to go silly fast stupid cheap and very safely.

I was misinformed on the grand am and grand prix sharing engine cradles? So that would not be a direct swap. But they were both available wkth the 4t60 so my engine and trans should fit in tbe grand am cradle?