Heads for a Magnum Stroker Engine

Thanks to 12many and Rumblefish360 for the replies
The car weighs 1320kg (approx 2900 lbs) with driver
Rear end is 4.1
Tyres are 28 x 9
904 auto, not sure of the stall as the car creeps forward at 2500 rpm so launching at 23/2400. We have a Wilwood brake pedal and master cylinder (for manual brakes) ready to fit to hopefully sort this.
We have been looking for a 360 core for around 3 months and no luck yet. The 318 is out of a low mileage dayvan and is standard bore so hopefully a good basis for a stroker.
Thanks for the heads up on the edelbrock victors, I have been reading everything I can find on the internet (Hughes and Campbell Engines) before I posted so I don't ask too many stupid questions, been collecting Mopars for a while and thought it was time to go racing. I understand that the Trickflow heads need different rockers as well
The ATK block is on its way so no chance to inspect it yet, I think the website says its a late magnum block, I probably should have waited and got some more information but it seems that most parts are in short supply
Best Regards