I've been reading on here about guy's using 273 rocker arms. Are they a good choice for a budget rocker arm? Would they be a good choice since they are 50+ year's old? I can understand it if you already have them. But if a person doesn't have them what would be the next best choice for a rocker arm? I've done a little research on stock mopar rocker arms and their ratio is all over the place from what I've been reading.