318 Build on the cheap
Yes it does 604 i think 1970 was the last year of the steel crank
Last year of the forged steel crank in the 318 (and 273) was 1967. These cranks were balanced for the light duty rods. I've heard some maintain that the 3/4 ton and above trucks with 318s had forged cranks, but I have not been able to verify.
http://www.allpar.com/mopar/318.html
If you have a forged crank and heavy duty rods, it would seem that you have a 340 (68-72) crank. Change from forged to cast cranks was a running change made as a running change sometime around February 1972. Here are the 340 crank part numbers.
1968-1971: forged crank, part number 2532457, 2128869, or 2843868; service part number, 2843868
1972-73: cast crank, 3462387, 3658393, or 3751841 (some 1974-86 cast cranks use the same 3462387 casting number as the 1973 340 crank); service part number 3751162
From what I've seen someone has lavished some attention on your 318. Hope you don't have to throw out much.