Too much lifters preload

Did a little work on my stock 2bbl 383 -66 this winter:
New Lunati 60301 camshaft complete with Lunati hydralic lifters
New timing chain and gears
Used but rebuild 915 heads
Mopar OEM steel head gasket
New 8.575 pushrods
New steel rocker arms

Here's my problem:
When I check lifters preload I end up with about 0.110 preload which is far too much.
The block is not decked and I've been measure the heads and they are not milled.
I've measure the old stock lifters together with the old pushrods and get a total lenght less than 0.020 shorter than my new lifters and pushrods total lenght.
I tried with my old rocker arms but get the same 0.110 preload
I tried to measure the height of the valve shafts and as far as I can see i get the same height compared to my old 516 heads.

Of course I can order a set of shorter pushrods but I can't figure out why?
Is shims out of the question? It's not that easy to find the right lenght of pushrods here in Sweden...