Checking for straight is very easy.
First you need something straight, a precision/ground scale or ruler, a machine table that has been machined etc. If you have a straight edge you stand it on edge and with a flash light behind see if any of the light is visable on the edge. Move it around and check all area's, no light your flat, if your on a machined surface you can feeler guage around the edges and finally if the machined surface is large enough you can use an indicator to run up and down the head on the sealing surface and do a parallel check.
If you machine you will probably want to match the heads, you'll also find when you cc your heads there are some varience in the chambers.
Mark
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