New Build 340/420 Questions

24 timing is way too much. Do you have the vac. adv. hooked up? Does the dist. have lighter springs in it? If it does start at 10 and if not start at 12. Leave the vac. line off and pluged for your first couple of drives. 93 octane with those numbers will be a gamble. Spark knock is no joke and will ruin a fresh build fast. ps did you use a quality comp. gauge? what is your comp ratio and did you cc everything?