235 CI would be not stock for a '67. '62 was the last model-year for the 235/261 series. 230 (not usual for a truck), 250 (common) and 292 (heavy duty option) comprised the L22 family of L6s made from model year '63 thru the '80s [minus the 230]. The L22 series is distinguished from the earlier Chevy and GMC L6s by having 2 separate side (lifter) covers. The earlier engines had a long one-piece cover. Both types are on the passenger side. The way to tell a 292 from a 250 is by the height of the lifter cover -- 250s are 4" and 292s are 6" tall. 292 also has a stagger in the engine mounts. 250 mounts are symetrical. The fuel pump is forward of the motor mount on a 250 and aft of the mount on the 292. The 292 is a great truck engine, not real fast, but lots of low end torque. Torque is comparable to a 454 at low RPMs, 350 is not even close. You have to rev up a 350 to get power out of it.
You can get the dress numbers from the pad on the block, pass. side aft of the distributor and post on the
www.inliners.org board to get the displacement, build date and factory of origin.
OBTW is there an airstrip at Agua Dulce, Calif? I used to ride shotgun with my buddy when he did touch and goes in a Cessna 150 into there. White-knuckled fun. Back when gas was cheap and these trucks were new.
3s&8s.