I live in Parker and want to build a FFR 33 Hot Rod. My concerns are emission testing and engine choice. Has anybody done this in Colorado. I have yet to get a straight answer from the DMV. Some say the vehicle must meet engine year emission standards (ie. 1967 chevy 350 to 1967 emission level) others say must comply to the year registered. I understand the Vin process and inspection only the emission is a mystery. any advice would be helpful.