I tried using your website and received a message back when I put in my vehicle. That I had made an illegally entry?? Not sure if this is an issue on my end or yours ? I need a recommendation for which of your product do you recommend for my application. 1972 Duster. 408 Stroker. Manual transmission (4Spd) 3.55 gear No A/C. Wanting to use a mechanical clutch style fan. Was not planning to go the electric route. Thanks.