Trick flow heads: different installed valve height

The 440 I am building has TF 240 heads. Complete heads, came with springs & valves.
Overall, I rate them very highly. But two things I noticed which surprised me:
- some valves had no shims, some one or two shims to achieve the installed height
- the intake face; it looks to be 0.040-.060" 'short'. Doesn't meet up with the block corners & the centre part of the head gasket [ where the exh xover is ] sticks out past the head. Don't know if this was done purposely or a machining fault.