too much play on the crank shaft...
 

How do you fix this? use shim? Time to replace? something on wrong...maybe the pulley? My dad was asking me for his 73 1303.

On a side note...his 71 1302
is comin along great!

Depends on where the engine in question is coming from. If it came out of a car after several thousand miles (and had the correct endplay to begin with) then something in there is worn out and needs to be replaced.

If it is a fresh rebuild and you know all the parts are good, you use metal shims in the front (front means front of car) of the crank.