Distributor vacuum advance hitting intake.......

Oldmanmopar said

Small Block, Put the engine on top dead center . Timing mark on zero , Firing or Exhaust stroke don't matter which. Install the drive gear with the distributor slot inline with the drivers side front intake bolt. This is the correct position for the gear. Everything should line up then . When timed the vacuum hose should be parallel with the firewall facing the passenger side .

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I pretty much agree with the above. If #1 is on TDC, compression stroke, then when you drop the distributor in you can rotate the distributor body CCW so the reluctor is lined up with the pick-up(std Chrysler electronic) or points contacting but "about to be separated". That will be close to #1 firing position which will give you your #1 terminal. When all is said and done, it should look like the Motor Manual SB distributor diagram. While you don't absolutely have to have their #1 as your #1, pre-made spark plug wires are made to fit that arrangement, and you won't have some wires which are too short or way too long.