“Max effort daily driver” 318 build vs “Budget” 400 swap

Reason I ask is mine came from a 72 Charger n was a 2 bbl...turns out its "COLD WEATHER?" one of the best blocks 3614230 "cast before 10/71" Chrysler made ...according to these guys... 440 Source.com Everything you've ever wanted to know about blocks and more....
I know the early ones are better, I am thinking the cast date on this one is 1973, I cannot remember.