Help needed with 318 (timing, ruff starts)

hello i have a 74 plymouth scamp and i just changed the distributor back to the oem style bc ebay sold me a junk msd knock off..any way timed it best i could by ear waiting on timing light from amazon to get here. just need some help where this should be timed correctly at what degree and what not. stock engine besides 600 edelbrock and alumimum intake...also since i have had the car it always cranks and cranks and cranks before it finally fires off and runs rough till it warms up, seems like i have always had to adjust the damn idle every new time it runs. . these are the new parts i have installed on the car

new gas tank, new fuel pump(electric) new sending unit , new lines, new alternator new external voltage regulator, new igniton control box(blue one) plugs , wires cap rotor , radiator , water pump, fuel pressure regulator, filter, air cleaner, battery .....alot of new stuff just frustration setting in bc i cant get it to run correctly , runs and drives just need some advice to see where i need to look. also noticed my after market tach needle has been jumping around and it never has done that( yes wires are all hooked up correctly) but the engine doesnt rev up up and down like the tach . any help would be appreciated..thank u