According to what I read in your other post, #2 is already taken care of. The original engine from your '52 would have been the low pressure oiling engine, but starting in '54 (trucks, c=qutomatic cars had it in '53), the Chevy 235 went to full pressure oiling. They filtration is still bypass, though. Not really a big deal, just keep on top of the oil change schedule and you'll be fine. This also eliminates #3. Your engine has replacable insert style bearings, just like a late model. Don't recall the exact year that changed, but it was before '52.
On #1 and 4, you'll get lots of opinions. Now, myself, I like the Holley Model 1904 carb. It looks good, it's dirt simple to work on, jets are easy to get (same as 4 bbl Holley), and they perform well. There's only one choice of intake if you buy new, and that's the Offenhauser. Several places carry it, Patricks and Langdons are the 2 most popular places. Langdons is also modified for water heat and to use the Webber designed Pinto carburetor. For a cam, you'll have to solid lifter. Had it ben a passenger car automatic block, you could run hydralic, but trucks are solid only. You've heard mine, I'm running a Howard M4F 3/4 race grind. it came from Patricks.
Along with the dual carb intake, you may want to consider a Fenton split header for dual exhaust. That'll get you that rumble, and they sound good, too.
