Cam and Stall Convertor

Again basing this on the fact that it's a bone stock 318 now, and you want to limit the mods to bolt ons that might work on the stroker too... I'd:
- keep the gears you have. The stroker will like them and they'll work for now.
- If you're trapping at 5K, that won't change much, so a cam that is designed to make power to 5500 is fine. The trick is to find one that is large enough under the curve but not enough lift to stay clear of pistons, and slow enough rate of lift to need the heads to come off to be cut for dual springs. I like the idea of a solid lifter deal, and the stroker can use the rockers... So I'd recommed the Comp Magnum 270S. It runs the 901-16 springs (cheap and easy) and won't get you near the valve to piston problems, and should make peak torque around 3K depending. You will need new rockers and push rods...
You may want to try the Performer 318 intake rather than the RPM too. The RPM s a little big for a stock compression 318 and you don't need the volume due to the relatively low rpm of the setup.
For the convertor - Get something like the Mancini branded 2200-2500 9.5 units. They'r echeap and work well. The trick is that 60'. These changes will give you some things to play with during the summer - Like collector length, carb tuning (I think you've got some improvements to be made there now regardless), and chassis setup. You should be able to do all this, plus a used intake for around $1000 with new rockers.