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Gasket leaks. Also, I've never seen a burnt out manifold, but have seen many headers with holes in them

Cast iron is a lot less maintenance than headers. You could check for any casting flash inside the ports before you install them. File or die grind if neccessary.

I know that original used parts are hard to find, but I would rather have an original used part, than a new cheapo part.

You could extend the bowl vent on top of the carb, just cut a piece of fuel line that fits snug on the tubing. Fuel can slosh out of there, too. Also, there are fuel bowl vent baffles available for Holley carbs for that problem.

If you have a heat riser, is it working ok? How hot does the engine get while running? When cold, the engine will run richer with the choke on. Maybe it's getting too lean when warm.

I'd hook the hoses up to the heater core and see what happens. If the core is leaking, I would replace it. You may need heat one day.

You can use modeling clay to get a measurement

A way that I have found exhaust leaks is to squirt some diesel into an engine at fast idle. It will make a ton of smoke, and should show where any leaks are.

This site lists many stations with non ethanol gas. Pure-gas.org - ethanol-free gasoline in the U.S. and Canada

I had a '66 Sport Fury that had a 383 two barrel. When I pulled the intake to put on a four barrel, there was a dirty, oily, messy tinfoil pack under there. I didn't know what it was, and just threw it away.

Bent axle tube?

Where the pcv hose was connected did not have anything to do with your problem.

Does the port on the front of the carb have full engine vacuum? If so, there is no difference where the hose was connected, the manifold port and the carb port both see full vacuum.

With the yoke on the rear of the trans, it will require a two piece driveshaft, with a slip joint in between.

Do you have the insulation pack that came stock between the intake and the valley pan? That would also help keep heat off the carb.

Any weak connections will have higher resistance when hot. Clean the battery cables, and where they bolt to the starter and the block.

It would be nice to get the engine temp down to around 180.

How hot is your motor running during the autocross? If you can keep the motor cooler, it would help keep the oil thicker.

Chrysler "Wedge" (B & RB Series) Torque Specs The following specs apply to these Chrysler Big Block engines: B Series, 350 c.i.d. 361 c.i.d. 383 c.i.d. 400 c.i.d. RB Series, 383 c.i.d. 413 c.i.d. 426 Wedge 440 c.i.d. Fastner Type Torque Specs Main Cap Bolts 85 ft.-lbs. Connecting Rod...

If it had been running rich for a while after the rebuild, the extra gas could have ruined the rings or cylinders