Yes, everything will bolt up to your L26. I just did it in a 99 GT. L26 bottom, Gen III top swap, cam... Easy peasy

Cam will require you to pull the timing cover, if you swap cam.

Sorry to hear about your motor... I debated on getting my L36 rebuilt and I about pooped myself when the machine shop told me how much... LMAO I said just do the heads, I'll make a coffee table for the garage out of the block...