What is the best small block stroker combination?

I am looking to build a new motor for my Demon. Looking for best combination for stroker I have a 73 340 block, 0.30 over, tubed for a roller, o ringed or can use 360 Magnum 380 hp Chrysler crate motor in the car as a base. Will be going to the RHS heads with a bigger valve. Would like to see 500+ HP

car has at this time:

360 Magnum 380 hp Chrysler crate motor

automatic transmission with reverse valve body

3000 converter

8.75 rear with 4.10 489 housing

MT 275 S 60 drag radials

Holley 750 hp 4150

M1 intake

headers into 3 inch exhaust with X pipe and 3 inch mufflers

turn outs just in front of rear end.

Mopar eletronic ignition box.

Mopar eletronic box

1.89 60 ft./4.87 300 ft. at local 300 ft track.