i just purchased a 1985 rx-7 and i was wondering what i would have to do to switch the carb out with fuel injection if i can get the fuel injection unit from another first gen?

i guess you could get your shit from the gsl-se, thats a FI 1st gen

The motors are not the same. You cant really make the carb'd motor FI without alot of work. You coudl do throttle body injection but its not worth the tiem and money. You need a swap.