I am building my first 240 it is a s13 coupe,thinking aboout putting silvia front end on it but don't know if you have to change core support or not.also want to build a s13 sr20 black top for it . (turbo included) what amount of horsepower will the trans take (like i said this is my first one so any info will be appreciated). so, let me here your info all is welcome.