momto5boysnc,
The ladies are giving you wonderful advice!

It sounds like math-wise, you have your son placed correctly in 4A/4B. You'll just follow the schedule in the Preparing guide's Appendix for that. I would also follow the schedule in the Preparing guide for Rod and Staff English. You've received wonderful advice on how best to place your son in Rod and Staff English. If he has had a moderate to strong English background in ps, I would put him Rod and Staff 4. By the end of 4, he'll be diagramming direct objectives, objects of prepositions, and prepositional phrases. If he has had a weak background in English, I would place him in Rod and Staff 3. Rod and Staff will also cover your writing assignments along with grammar, so writing will be covered as well.
As far as dictation goes, I would use the dictation in Preparing Hearts (most likely Level 3, if he has never done dictation before). If he is an outstanding speller, you can place him in Level 4 dictation passages. Dictation is harder than it looks! If your son is reapeating most passages more than once, you have him placed too high and should drop back a level. We want kiddos to feel successful. Although, the passages in "Bigger..." will most likely be too easy, unless spelling is his weak area.
As far as Drawn into the Heart goes, as long as your son can work somewhat independently and does not have significant writing issues, you can place him in Level 4/5 of Drawn into the Heart. I would do Drawn into the Heart 3-4 days a week, starting with books that he enjoys and with the genres he enjoys most as a reader. Then, next year, you will finish out the genres he did not do this year.
I would also require him to do copywork from the included poetry in "Bigger..." (doing a few lines up to a stanza a day) to work on his penmenship skills. This will be excellent practice for the upped level of writing scheduled in "Preparing Hearts..." for next year.
I would have him do all the rest of "Bigger...", including all copywork, notebooking entries, vocabulary etc. as scheduled in "Bigger...".
Blessings,
Carrie