Actually, the American Falcon was phased out in 1970. However, the Australian Falcon continued to be in production and is still manufactured as of today, branded as the Ford FG Falcon.
Not that the above history helps you, I don't think that the Australian Falcons even had a 302 in '74.
I went ahead and broke down the number you provided:
D=Falcon (60-69)...so I believe a Maverick may be correct
6015=Engine ID tag
So, you have a 1974 302, most likely from a Maverick