Thank you guys, I really appreciate the information in your replies and you taking the time to help.
Just to elaborate. I’m not making a turbo build just NA and looking to make a usable 200-220.
Both the machinist I use and trust and his friend who has professionally built and raced Z’s both said to try and find out more but in their opinion I should just look for an N42 as that’s the route they have always taken. (Never used a P90 before)
That’s proving harder than it sounds and even though I have seen some available in Japan for sale by the time I ship and tax gets added I’m probably better trying to source one from the USA.
So if I were to use the P90 for now as you guys suggest, is it worth taking that .080 off to reach 10:1 then just add a cam, adjustable tensioner and adjustable cam wheel to dial in?
Presumably all this parts can transfer to a N42 or square port P90 at a later date?
I hadn’t read about cam tower shims before so I’ll have to research that.
Thank you again and please keep the knowledge coming, it’s of great help