383 engine main bearing decode

[Slob]

Hi there.
Just wondering if anyone may have come across or can tell me what size these main bearings may be. they look original but No sizing on them just 6-68 TC. I am wanting to re bearing an engine without Removing the crankshaft if possible.
Thanks again

 

[68-500]

If not marked 010 or 020 I’d assume standard.

 

[RemCharger]

This is an original out of a 68 440.
I'd say no mark, std. Like 68-500 says

 

[Slob]

If not marked 010 or 020 I’d assume standard.

Thanks very much . Ill go with that.
Cheers

 

[69L48Z27]

The numbers are a date code. You should measure your clearance and not guess based on what was in there.