It is blocked by the exhaust manifold!!! Long story, but I've pulled the 1970 350 out of my 1973 K5 and dropped it into my 1983 c10. After bolting everything up, we discovered the hole for the oil dipstick is about an inch below the drivers side manifold, just behind the down-tube. I have tried using a torch to bend the dipstick tube, and that sucker doesn't want to cooperate... wonder if it is stainless steel? If I could, I would put a gent 'S' curve into it and it MIGHT duck under the manifold and still allow the dipstick to slide through. Or I could get about 6" of brass tubing and try to fab up a tube... Failing that, I MIGHT simply plug it... the engine doesn't really burn oil, and I guess I would change the oil every 3000 miles or so and let it ride... what do you guys think? Any tips?