As usual all the people you have spoke to are dumb fuks. The law clearly states it will be titled as a 2008 assembled vehicle and under remarks it will say replica 1965 ford. That absolves you of emissions.
#2 YOU DO NOT PAY SALES TAX THE FIRST TIME YOU REGISTER AN ASSEMBLED VEHICLE IN TEXAS. Reference motor vehicle tax manual 1d, or since I am nice
http://www.window.state.tx.us/taxinfo/audit/mv/1d.htm
I scanned the law as far as replica but to no surprise it will not let me post, it is to large like my whacker i will try to save under my album