302/714 on 73 318 pushrod length

Ok I have a 73 318 I have a set of 714 closed chambers off of a 91 318 which are same as 302 heads what push rod length should I get?my engine is together and my daily driver so it’s not apart to check this. I live in an apartment and I have a freind that is going to let me pull my engine reseal it put these heads on install headers etc but I want to make sure I get the right parts so it only takes 2 days to do it. The current engine has been rebuilt but they installed alote of seals wrong and it leaks alote so I don’t need info on the condition of my 318 it’s really good shape