Delco Remy HEI firing order

[JulioK]

I am still sorting thru numerous minor issues with my 72 stepside lwb 307. Lots of work that has been done by previous owner seems to have been a little flakey so I am slowly trying reestablish proper base setup. It has a delco Remy hei and I am fairly certain that the firing order is correct but I am not sure how to confirm where #1 is on the distributor. There are no marks that I can find to indicate where #1 is. I think the wires are in proper order but possibly one position off on the distributor.

Thanks

I am new at this so cut me some slack if I said something ignorant.