I was having a chat with seamus up in qld he reckons big cams for a 4A are just your average cam for a 7a build I cant remember exactly what cams he was running something like 288 and he was running out of power at 7500rpm. since I'm building an engine purely to fry tyres I thought going for the larger size cam would be of benefit as it will be revving somewhere in the 8-10k rpm range. I think with the ones I've picked in a 4a they dont make power until 6k but have a great power range all the way to 11k or something ridiculous. I may still look around for a better cam I still havent decided completely on them
As for compression I havent worked it out, the engine was previously a mates who built the motor, ran it for 5,000km's and decided on 1UZ I bought it from there.
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