What year did Ford switch from 3 bolt to 4 bolt crank balancers?

I want to find a single groove crank pulley if at all possible for my 302, but its a later model with the 4 bolt balancer. What year did Ford start using the 4 bolt instead of the 3? Anyone know a particular Ford that would have had such a pulley? Obviously a non-power, non-ac, pre-smog.

Will a pulley from other Ford engines fit the small block?

So many forums here it was hard to decide which ones to post the question.

1969 Ford went to 4 bolt along with waterpump and timing cover change. I would try looking a base models like pickups, Broncos, Falcons ect. Hope someone else can share some hands on experiance with this.

heres a 76 Bronco 302,3bolt. I also have a 69 302 that i swaped to a 4bolt from a 79 LTD to get the serpintine belt setup