SPEEDMASTER ALUMINUM HEADS

Now I'm debating if I should change the left side head to. The 440 or stroked 572 has ran for like 15 - 20 mins max and the left side head seems to be ok so far. My concern is what if I'm driving and the Head decides to fall apart on me. On the other side I'll need to put out between $1500 to $1800 to get the 2nd head that has intake flow between 280cc and 325cc and I'll have to wait a couple of months to do that. I started bringing my 68 Charger to life in 2016 after it sat in the same spot for over 25 years. Invested a whole lot of time and money into it and have it come out with this bullshit. ----PISSED---