Carb and head ???'s

You guys (and gal's) have been great and your help is appreciated....

was thinking last night about the 89 heads I am putting on my car, If I increase the pistons to 9:1 compression 84 spec's, are the head cc's different in 89?? increasing the compression more than 9:1????

or am I being peranoid (sp)....

Also, the Holley carb I originally intended to order was a 600 (was going to order it today), is that going to be enough or maybe a 650 or 700???

the planned engine mod's should keep me happy for a while, next step will be NOS...

thx again...

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Black, 84 GT, T5, ground effects, shorty headers, dual exh., rear spoiler from a 87.. In the works; 4:10's, 89 ported heads, edelbrock Performer, matched cam and holley carb (?? size)