S5 turbo short block in fd
 

I HAVE alredy buy a 13bt s5 engine complet and I have rx7 fd3s
but my problem is the rear rotor housing and rotor is scratched,
my question is:

can I use the 13bt s5 blocks directly in my fd, I KNOW the mounting is not like fd, i want to take only the fd rear housing and front cover from fd3s and compined to the s5 block? can I ?

I want to make that because I didn't have seals :) or any replace part i want to use it now before i make another porting engine next year

you may have to buy different engine mounts but block will work