Ok results are in for my Cam upgrade. I had a last minute change of heart and went for a tuner well regarded by many in the QLD VF club. I'm glad I did. I ended up going with a 224/232 @ 50, 580/590 lift on 114 LSA, with Lunati double Spring kit / hardened pushrods.
435rwhp or 320.1rwkw at 5800rpm. The w375 was snappy before but now it's a brute! I'm happy to say the least. It's off to the drags Wednesday evening 3rd August so I'll post a video on YouTube shortly of the quarter mile run. I've got a clip of the dyno run on there already. The link is below the dyno chart
https://youtu.be/XMiFOCEQXe0