Is this a crack

I bought the 71 Datson in 1975. Been on and off the road ever since. In high school they said can't put that mopar in there they're too big.
So the other day I was Kayaking across the lake. The engineer, legend kayak Builder Racer, Auto Racer says the 413 is heavy!!!
I said
I don't think so, see you at the race. So I thought I needed more power and got the 440