the j30 block will not fit in a f23 accord cause the front frame is longer. besides its not worth it.. just drop in a h22, almost direct bolt in with alot less problems, and tons more options. i have a cl with a j30 in it so im not tryin to talk you out of doin it.
but if your insistant and do it i would suggest you doin a cl type s swap j32 260hp. or an odessy 3.5l j35 swap 265 hp