depends on the rest of your setup, on a high compression motor with a considerable amount more power then stock.....yes, you want as smooth a flow as possible, considering your motor is most likely stock, no, dont bother wasting your money, go buy hamburgers or tacos with it, me gusta tacos mucho
on a STOCK cam, no, installing an adjustable cam gear on a stock cam is useless.......diu SAVE your money, buy an aftermarket cam like a ZEX cam, those have had REAL good results on SOHC motors