Both HSV1 and HSV2 can be transmitted oral to genital and genital to oral.
There are no stats available about transmission rates of HSV1 genital herpes. However, outbreaks are less frequent, and the virus sheds less than HSV2.
As well, know your partner's status. If he already has oral HSV1 (as the majority of adults do), he has significant protection from getting it genitally.