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You can also try switching to a standard pressure relief spring. I think the standard Mellings are rated at 45psi.

I would think so, just make sure your level is full at all times.

Unless you want that mixing with your oil.

How old are your u joints?

I seem to recall those used a rubber sealing ring under the metal washers.

If it's the oval 3 pin it's the RH. The RE had the round connector. Either way, just a guess, but the overdrive/lockup solenoid could have failed which would require dropping the valve body to check and/or replace. While it's out I would do a thorough cleaning and rebuilding of the valve body. A...

Do you have the oval 3 pin connector or round connector near the neutral safety switch?

Converter possibly not coming out of lockup. Most likely 46RH if original.

If you have the proper clearances you should be ok with a standard pump with a half grooved main.

Some interesting info regarding the effects of grooving from Mahle/Clevite. https://www.mahle-aftermarket.com/media/local-media-north-america/pdfs-&-thumbnails/support_technical_bulletins_pdfs/tb2051.pdf

I used to order a lot of parts from TSR in NH. Carl owned the shop but I think his son is running it now since he passed away years ago. TSR Racing Products

Are you using an advance timing light? Is it set to zero?

Do you have the broadcast sheet that matches your vin?

Here's one with a 13 month difference.

As mentioned, the cast date can vary widely. I have a SPD of 4/23/68. The block was cast March of '67. Assembled 4/17/68.

Make sure the 727 you get is actually for a big block.

Yep, same angled plug heads from a previous thread. Thread '1968 Big Block Angled Plug Heads' 1968 Big Block Angled Plug Heads

here you go

Did you buy the car with the engine built the way it is now? If so, hate to tell you this but I would be verifying that the timing chain/gearset were installed correctly.

Correct, some of the early 904's had ptkd, unlike the aforementioned 727's.