decking block..questions

[Old Guy with 87 GT]

i have plans in the works to mill the deck on my moterblock to further the compression ratio ......i,m not going to crazy toleraces i'm only milling to a safe tolerance with a few exra thousants in case i ever have to resurface my block agian ,i forget the actuall number but i'm going to bring my pistons as close to 0 deck as can

wanted to get opinions and see if anybody has had any bad experiences doing this

the combo going into it = speedpro forged pistons(flat tops with 4 reliefes) , plasma moly rings ,clevite bearings, stock crank and rods (with arp rod bolts) e-cam ,ported/milled e7ets......see sig for everything else

i'm also getting it internally balenced ,bored 0.030 over , getting lower intake matched , checking valve clearance and adding a head stud kit

any opinions would be valued .........
also any guesses at what compression ratio i'll come up with ?(heads have 020 milled off em )