LA Timing 180 out

Hi All
Made the rookie mistake of lining the cam timing dot to dot on the first LA rebuild, managed to get it fired up once I realised it was firing on number 6.

Now I've read this thread http://www.forabodiesonly.com/mopar/showthread.php?t=63518&highlight=318+firing+number and a few others and have confused myself on how to correct this, do I just remove the dissy and reinstall 180 deg or do I find TDC compression stroke number 1 with a piston stop and re do the intermediate shaft so it's pointing in the right direction?
Thanks