New Owner - Please Help

[organcory]

Hello all,  My wife and I are the proud new owners of a 1966 Mustang, V6-200 (I know, I know, its not a 289), but thats fine.  Are the 66's 6 volt or 12 volt?  It was also backfiring on the way back from where we got it.   It drove 2 hours home and then backfired several times.  We turned the engine off and then it never started again.  I am in the process of charging the battery right now.  Also what is the easiest way to replace the timing belt?  What are the best repair manuals?   If someone can please give me some guidance on what to do, I would greatly appreciate it.

 :-D