jdm4alifetime

Hi every I think this is where to go to get help lol not real sure so I have a 93 civic ex and did a b18b1 swap with gsr head 95 integra block 94 gsr head and have filnally after 2mnths got it dropped in and ready to fire up but she wont fire she just keeps backfireing outta my header what do I do and I have it at top dead center with both arrows on cams at 12 o clock position please help me and thanks for taking the time to help in advance