ther eis a way but you will need parts for the right year/style of truck, everything changed in 73
but if you want to find out the hard way then good luck
420 was last in 67
465 was first in 68
this stuff all changed in 73, all of it
need a donor truck, all the parts
trade chassies with someone, or with a yard
most yards charge about 250 to 300 and you can strip a whole vehicle but cant keep both the body or the frame
only one or the other
good luck