ADVICE PLEASE I have a 66 mustang with 289 and i am wanting to put some gt40 heads on, which ones cobra or any other??? I am new to this site so your suggestions i would value. I will be using 4 bbl and weiand warrior intake and mild cam extractors. if i use the cobra 40 heads with 1.7 ratio will these work with hyd flat tappet cam. or should i use standard gt40 heads and add comp cams magnum roller rockers etc.