how dificalt would a 5 speed swap be from a auto trans. would it bolt farley well in place of would i have to modify the flor and trand tunnel?

-=Lance

 

What year?

 

https://www.rx7club.com/1st-generation-specific-1979-1985-18/questions-about-auto-5spd-swap-85-gsl-204571/

That should cover everything from 81-85.
Same appplies to 79-80 if you use the 79-80 manual trans. If you use the later trans you will have to modify the tunnel and modify the shifter trim and boot for fitment or custom make a shifter.