84_mustang

its an 84 mustang i dont know if it was a 2.3 or not but someone already put an old 302 it has points i dont know how old that is but it runs and it runs good, now what im doing is i have this 351w that has internals and i want to know if the gt40 heads will fit on it with my edlobrock street performer intake? and if it does, would the rear end be posi or what cuz i dont know anything about it i just know that its an 84 and it has a v8 in it and i was told that its not stock, but it has true duals and sounds great but it didnt come with all the brackets for the accessories so i cant just run it with that but thats my question thanks.