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If you want zero deck with those pistons and rods, he's probably going to have to mill your deck about .025", give or take a little for block squareness and casting tolerances. Nothing to worry about IMO.



Seriously ??? Would you cut .025 off a head and not worry about anything ? Not cut the intake side of the head ???

I have to do some math




Well right off the bat we almost all go to a .039 fel pro composition gasket so that puts the heads back up .017 to .018 right off the bat from stock .022 steel shims. so little change then unless you do excessive milling to the head after that nothing to worry about.
That will put his true compression around 10.2 to 1 (I cc a set of stealth's last year all were 82.5 to 83.5) so with the 3000 stall you will need for the 509 should run fine on 89 91 for sure.

As said clearance the heads on the intake side for pushrod think even 5/16 will be to tight.

Degree that cam in about 103 (102 to 104) it will really wake it up.
If you do not degree it they are often around 107 to 109 and you should use a 4000 stall! Even at 106 it will need a 3500 to 3800 stall.
trust me I love that cam but it needs to be degreed in with some extra advance.
Set the total mechanical timing to 38 all in by 1500 (i like 1200) and you should have a stout little combo!