340 cam in a 318

And then you install the valve train and all the bullshit math you did is just that. You don’t have a clue what the P/V is.
How would you know the maths is "Bullshit" if you've never done it to begin with?
Maybe your the bullshitter, not the maths?..
Actually I do install the valve gear and manually check the piston to valve once the cam is installed.
Every good engine builder does.
Saying I don't know what piston to valve is may be the dumbest thing you've said yet.
Why would I bother doing the "bullshit maths" if it's just going to be wrong and I have to do a bunch of machining to get it in there or have order another cam? Especially when I'm being payed per hour to build performance engines?
Doing the "maths" allows me to choose from a range of lobes I know will fit in the space I have after deducting the clearances I use.
Maybe you just have maths issues and prefer to use crayons.

You know, you sound a lot like Yellow Rose..