I would just recover the 74 seats unless you are going for a concurs car and worried about points being deducted.
I'm just going for a nice interior but the OCD in me says I won't like the 73 pattern vs the 70 pattern.....
My ass won't know the difference though so that's a consideration
Ideally, I would like to find a set in as good of condition as the 73's but I fear any ones that I do find, will be in worse shape than mine....