Marcos Maniacs

Hey guys,
         The only local gas station here in Co. just quit carrying 
leaded gas. Soooooo   I was thinking of changing the engine over to 
unleaded. I also do get tired of adding lead. Does anyone know of ant 
drawbacks or stupid things to watch for? Don got that diagram thank 
you. Also AVO and Spax shocks are expensive. I heard at our British 
car show that there was an American made shock that was adjustable 
shock does anyone know of any such beast?
                       
                            thanks,
                                   Hal #5353