Repairman,

That page you found is an excellent primer for prepping a head.

If you do nothing else, use his idea of the press and bathroom scales to check the relative spring rates of your springs. Summit sells a spring checker to use in a vise, if you are so inclined. If the springs are not all equal height and rate, they are probably OE, ancient, worn-out. Source new ones.

Have new hardened seats installed in the exhausts. Let the machine shop install the valves and your (if needed) new springs, they will lap them in for you. It should cost you relatively little to do that.

I apologize for assuming you would know engine building terminology. I sometimes forget that not everyone grew up with grease under their fingernails. ;-)
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Mr. Shannon DeWolfe -- I've taken to using mister because my name misleads folks on the WWW. I am a 52 year old fat man.