Up Grades on Stroker-Suggestions

Twists, turns, low flat runners, distribution issues and fuel puddling... not a good intake..
No point working those heads if your manifold kills them off. My advice would be to get a good single plane hi rise manifold , better exhaust, dual 3 inch ( all Aussies like that ;) ) and then start sorting from there. If you like the look of that intake you have ,you can always put it back on once the motor is sorted. Then you can spend some time on it to get it to perform as well a a single plane.