If I were to state that I am using Perl Template Toolkit, PostgeSQL, Apache with mod_perl, CentOS, does that expose me to attack giving away information on possible vulnerabilities?

Not for a personal website which presumably would not be singled out for attack for any specific reason. Only the volume-based bots will likely impact a personal site and they won't be reading anything you've written to see what you are running. Anyone running a non-wordpress site will testify to that.

I installed a firewall and interface to iptables to attempt to limit attacks. Is it possible to state which firewall without giving away too much information?

Same answer for the same reason. Note that iptables is a firewall interface (to netfilter).

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