Ramcharger cam questions

If it was me, and the compression is stock, as is the TC, and the 3.21s are staying,an a DD Ramcharger; I would leave the factory cam in it.
4bbl and headers are good choices.
At the compression ratio of your combo, any bigger FTH will just trade away torque down where you always need it, for a few HP where you rarely go.
Now if you had a 9.8Scr or better engine and a 2800 or better TC and 3.73s, from me you'd get a totally different answer. Or if you were at 3000pounds, again different answer.Or not a DD, different answer, again.