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If it starts then dies instantly, sounds like you're loosing fire.

Thinking through 56 on 3 spd's.

Is one of the lower bolts too long and hitting the rear of the cluster gear?

If it is coolant, there may be a crack in an exhaust port.

I would think if the engine had good compression and the blowby was minimum, one pcv would work ok

Are you sure you're not hearing spark knock, loose valves would clatter all the time.

It might have come loose and somebody brazed it to the pan.

Flat tappet cam. did you use the zink additive mixed with the oil on start up and run at proper speed for a length of time? New lifters on an old cam can wipe out the cam lobes, and if it's getting louder, that sounds like the problem.

Does that spark plug have the screw on end cap, and is it on the plug, and the wire boot might be swelled.

The input shaft does turn in the pilot bearing anytime the clutch is depressed, otherwise you can't get it in gear.

That 16 tooth spline fits late 40's trucks through the 50's pickups, if you can find one with all the same measurments at yours, new ones can be had.

Could be it was put there to ad one of those ole wolf whistles.

Noise that goes away when the clutch is depressed in most times the transmission input shaft bearing. The input shaft should only have a very small amount of movement if the bearing is good.

To tell, turn the manifold upside down, measure where the manifold rests on the cork gasket, if 5 inches, it's 289, 302, if 7 inches it's 351-W, 351 C engines have a dry intake.

I think on 48 or 49 they changed the spline twist on the low, reverse sliding gear and output shaft.

One thing to watch on really rusty freeze plugs, when you drive them in, make sure the center doesn't push in and leave the outer flange stuck in the block.

I put a 272 in a 47 1/2 ton and used ram horn manifolds fit just fine, steering shaft is close though, oil filter is also close, but your 52 I think is a wider frame, I also got a radiator made to fit the 47 support, but only had one top and one bottom hose nipple.

Could it be a blown manifold exhaust gasket making that noise?

Mabey to let more oil get to the cam flange?

Hogshead is old time term for bellhousing.