You want matching components.....................high pressure fuel pump takes high pressure solenoids and a low pressure pump takes low pressure solenoids......just make sure all the parts match.
I would think most are low pressure for carbed apps ,if you did get low pressure solenoids and a high pressure pump you would need a high pressure regulator.
So basically its going to depend on the solenoids you get as to what pressure they are for..........There are tons of well put together kits on the markett for this and are safe as you can get shooting a gasoline fire and probably cheaper than you can buy the parts for it ,unless you are going with parts you already have or used pats.....Just be carefull and keep a nice a/b/c chemical fire exstingusher at all times in the ride where you can get it /not in the trunk where the fire will prevent you from getting at it.

Heres a link for a forum that has lots of fire shooters on it.....
http://www.jalopyjournal.com/forum/index.php?