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the mbe heads are the aussy ones, they are very thin around the intake port,, and everyone has issues with them cracking in the bowls,, also the guy from australia doesnt want to sell them to the us anymore cause he is afraid of lawsuits

i dynoed a motor that bes had done and it was down 60hp from what they said,, dyno's are tools

everyone throws around numbers but to run fast in a/sma at about 2900lbs,, 420 inch motor,, 7.80's-7.90's would take about an honest 1000hp at 2000 ft air



The Aussie P5's are an exact copy of the Mopar P5 head, right down to the part/casting number from what I have been told. They even copied the cracks is one remark I have heard thrown around.
An R4 block will take 400ci, Aussie Pro Stock have been doing it for years.
I doubt that Mopar will get back into making them, Unless Chrysler Australia make a push for them to be produced again. The Mopar backed car over here has their engines done by Rick Watters nowadays, perhaps pick up the phone and have a chat with him.

Alan Jones