Slant 6 4 barrel carb

drauhut said

I have read that the camshaft can be replaced WITHOUT removing the block, is this true?

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Your biggest challene (besides a straight out path as Pishta mentioned; be ready to jack up one side of the engine for that) is getting the lifters pulled up. You have the the mechanical cam and lifters and the lifters are 'dumb-bell' shaped with a narrowed 'waist' in the middle. If there is a lot of varnish built up in the engine, then the lifters can be very difficult to pull up; varnish will form in a ring inside the lifter bores in the area of the narrowed waist, and the lower part of the lifter will not want to slip past that easily.

Be prepared with some very long needle nosed vise-grips or surgical forceps to grab the lip and work them out (like a 10" reach), as well as some Gum-out to work down around the lifters to try to soften any varnish ring. (Change the oil afterwards.) If your engine is pretty clean on the inside, then no issue. (I was the lucky guy with the old sooooper-varnished engine, and had to drive the lifters out from the bottom with a hammer and a maple dowel when I tore down the engine!)