EDIT: Currently have two broken intake bolts, front two on the motor next to the coolant passages. About 3/8 of stud sticking out with intake off. Tried a stud extractor with no luck, it needs more space than I have because of brackets and so forth. Trying to pull the intake off a later 350. I had to wreck the distributor cap to get it off - apparently the bolts are either 5.5mm or like 13/64ths - a 7/32 socket would slip on it, a 3/16 too small, a 5mm too small, a 6 slipped easily. Then I broke the distributor hold down bolt - okay, intake is going anyways. Now, I get to the front four bolts. Second one back on the right came out more or less okay and was coated in oil. Front one on the right snapped off. Tried both left ones - second one does NOT want to move, front one moves a little but it's stiff enough I could be twisting it off too. I've been using just a 1/2 drive ratchet on most of these. The third bolt I've broken on this motor. I'm not sure the wax trick would work simply because the bolts don't go directly into threads - they pass through the smooth hole in the intake first. Access on this engine is a bitch because it's currently sitting in a van, so you're right under the damn cowl to try to work. I figure I can probably get away with the one broken bolt, but if I bust those other two, then what? Drill them out? Try to spin them all the way through, maybe in trying to drill them out, and pull the valve covers off to get the stubs out? Except I think the very front ones feed into coolant passages, so I'd have to try a magnetic tool to get the remains of the bolt out. I have more bolts, that part is no big deal. Oh, and of course the fun of drilling up a bolt over the open valley, so chances are no matter how careful I am to cover it a few pieces will get in the engine. Most of them came out easily, except one at the rear that I'm fairly certain was pulled before (this clearly had the trans replaced at some point and when it was put together they did a half-assed job). So I have to presume if they won't move, the threads are munged up somehow.