Slant Won't Crank

:cheers: Hey to all, this is my first post in the forum so i first wanted to start off with a hello. I've been lurking the forum and decided to go ahead and join you guys.

Well with that said, i have a 225 slant in my 73 dart swinger that won't spark. It was running ok 3-4 days ago and haven't drove it since. I left the battery unhooked because i had just dusted all this dirt off of it. The starter is fine and cranks but the slant wont spark at all. Im wondering if its carb or something, and again its been sitting for 3-4 days withought being touched.

Thank you guys in advance for any help you give me, and p.s. if you have yet to notice i am only beginnng to learn anything and everything about cars this is my first one and i'm damn proud of it.