Radar's (Francis) GMC project got me interested in the Gonkulator database for the old GMC. I dont have one myself and data, stock specs, is really sparse. Can anybody provide any of the following:

* Stock rpm/tq and rpm/hp for the 256cid, 1year only

* Stock cam info - lift, duration, lobe centers. Duration at .050" is ideal but of course unless somebody measured it, that data just wasnt listed back then.

* Was the stock cam the same, 228 thru 302 or did the lift get higher, etc?

* Stock carb info for 228-302, CFM great but even venturi/throttle diameters would help.

Like most engine families I start out guessing at the stock specs and then fill in the blanks. Google not too helpful in this case!
Much Thanks