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IMHO the limit to mill down is:

-adjustable or not valvetrain or custom pushrods. You have rocker shims available though.
-clearence between pistons and valves
-iron or aluminium heads thinking on max compression an iron head can take without pinging or predetonation
-gasket planing to use

I'm planing myself mill down about one milimeter ( around 050 ) and mount 030 rocker shims...the 020 difference will be taken by hidraulic lifters, being preload won't be a BIG problem with the new ( although used, but low mileage ) Hughes valve springs I got at Carlisle. They are more compression valves than the HiPo stock ones even new.

That's just the plan that will be defined once pistons are down in the hole and measure the TDC with block deck.

Planing to use metallic headgasket

my cam will be MP 289/474 ( but I have a resto HiPo MP cam waiting just in case )

Porting on the way too

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