Wally - On your question "what book should I buy?", for your 1962 C10 you will want to start with a 1960 Chevrolet Truck Shop Manual like this reprint form Classic Parts. Then you should get a 1961 Shop Manual Supplement, or you can get a CD with the full set of 1960-62 Shop Manuals.

These are available from a number of other sources too and you can also find used originals for sale if you do some web searching.

On trying to pry your existing lifters out by inserting something between the cam and lifter I would highly suggest NOT to do that unless you are planning to replace them or have them reconditioned. You are likely to damage the surfaces removing them in this way. And definitely do not use vise grips to try and grab/remove the lifters. Not only will this destroy the lifter surface, but it could also damage the lifter bore when trying to further remove the damaged/scored lifter.

~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)