If the Buick 305 is really a Chevy 305, then the motor mounts will interchange with a Chevy 350.
75 lbs--rods 45 lbs
Weak oil pump? Clogged oil screen?
YES they are the same.
The headers for a 350 and 305 are the same.
No they are not.
Honestly, junking the 305 and installing a 350. The 305 is basically an underbored 350. Because of it's small bore, large valve heads can NOT be used because larger diameter valves will actually hit the engine block. The 305 is a good fuel economy V-8, but it simply is NOT worth messing with if you want to go fast. 305's also have weak blocks, connecting rods and crankshafts as well. Ask any engine builder and they'll tell you the same thing. The 305 is good for what it was designed for, but for performance, it's basically junk.
Oldsmobile used to make a 307 V8, but it has nothing in common with a Chevy V8.
NO they are not the same.
the block & heads are the same you just have to pull the 305 out & put the 350 back in
yes
yes