I need help....i just bought an F20A dohc...but i need to replace the header....what parts do i use to cover that....some say the h23 will bolt just rite on...n some say different...i need to know.....asap....n timing belt...what size....the h23 tranny ...will that bolt on the f20a???? as b4..some say yes some say no....whats the real deal???