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Jet sizes help please

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nisjeep

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I have just started digging into doing up all four carbs on my 99 Challenger. I have genuine Mikuni kits . Including needles and seats.
Both MAG carbs have 145 mains and both PTO carbs have 142.5 mains? What's that all about? Should it not be the other way around?
All four carbs pop off at 40psi.
All carbs have 67.5 pilots. I must add we run 97 octane gas at sea level.
Any thoughts?
Thanks
 
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