H/C swap, now BAD misfiring

I cranked up my car today after doing a heads and cam swap and at first it was driving alright, then it started to misfire at low throttle, now its so bad I barely got it home it limped all the way. There is also a ticking sound coming from underneath the engine that correlates to RPMs, Im worried it might be a collapsed lifter and thats causing my problem, or it could be a loose header bolt, but thats not as big of a concern, I REALLLLLLLLY neeed to figure out the misfire, can anyone guide me in the right direction; I HAVE to have the car driveable by tuesday night
 
Start by going over the basics first. It's very easy to accidentally switch plug wires, as I've done it on several occasions, because I didn't learn the first time :( Pull codes while you're at it, and see if it gives you anything.
 
ok, so I checked my wires #7 is not on the plug good, and it got burned up on the header, so is this more than likely my misfire and clicking? If so where can I get a single #7 wire without paying $40 for a new set?? if anyone has one preferably red in decent shape I will buy it from you and overnight it.