My 340/420 Stroker Build
It can use more cam except every time someone pushes up the duration there pushing up the rpm band the engine will work in which leaves the OP’s comfort zone and the 3.91 gear ratio.
Truth is, any engine you build can use, operate and work awesome with the very last cam at the bottom of the page of the race only list.
Considering he is using the 3800 converter, the cam he selected with the words of him saying he is not to comfortable with going larger is making a wise choice and one I endorse. The old saying of it’s better to error on the small side applies every time to a camshaft.
He can always step up later if he doesn’t like the top end charge of HP.