Crossed jumper cables, car won't turn over.

I just bought a 78 CJ7. 304 V8 with 4 wheel drive. I was driving it home from where I bought it when I thought it was sputtering a bit so I stopped at a gas station, and pumped ten gallons of gas. When I went to start her back up she would whine a little but wouldn't turn over. I knew it was having problems holding a charge so I figured I'd need to replace the alternator. I had someone go to jump me off, wasnt paying attention, and crossed the cables on my side. (Pos to neg, neg to pos) needless to say I'm never gonna make that mistake again. I replaced the battery. At this point I have voltage across the solenoid, and can jump across it. The belt starts spinning and I can smell gas but the engine wont turn. This leads me to think I might not be getting any spark? I have very little experience working on cars and I bought this Jeep to learn on, however with a point in the right direction I'm sure I'll catch on fast. Any help at all would be greatly appreciated.