340/416 Stroker Kit questions?

While my 340 is down due to a wiped lobe on the cam and since I have decided that I need to do a full rebuild, Might as well go all the way and Stroke it while I am at it. This will be my first solo engine build and want to make sure I am getting the right combo. Recommendations and suggestions would be greatly appreciated.

Street/Strip weekend cruiser. Must run well on Pump Gas.
1969 340 Block (.030 over)
Lunati Cam and Lifter Kit 10200704 (276/284 Dur, 513/533 Lift)
ProComp CNC ported Aluminum Heads (Closed Chamber 68cc)
AirGap Intake
904 Street/Strip Trans (All the usual upgrades)
MSaine Custom built 3000 stall converter
3.91 Gears in the rear-end

Questions:
1. I am guessing that with most any stoker Kit, This should be 450 to 500 HP when done. Will a Cast Crank be sufficient or is a Forged setup required here?

2. Pistons? Dished or Flat Top? With Aluminum Heads is 11.3 to 1 going to be OK with Pump Gas?

3. Which Stroker Kit would you buy for this set up?

I of course want as much HP as possible. I am not building a daily driver here but do want to be able to drive it an Hour or more each way on the way on the interstate to the strip and to Meetups on the weekends.

1. Scat cast crank is fine and has great reputation. If you upgrade to much bigger cam or nitrous might want forged? But when you do that will your 500-525hp crank be your only bottleneck? Will you want different pistons, heads, etc.? Might just build another motor at that point? Maybe not? Things to consider.

2. I run 9.7-9.8 measured with quench and comp XE274-S in my 416. It will ping at much more than 33 degrees total with the pump 91 gas we have in California. Thats with Edelbrock 60779 "63cc" heads measured at 65cc and Scat rotating assy with ICON forged pistons.

3. We measured everything before hand and fit everything and the SCAT rotating assy I bought from Brian at IMM Engines he suggusted was spot on.