Being a 727, what kind of abuse will a 518 take? Does a lockup convertor make it less beefy, or can one be built to take some power as well?
I'm pretty interested in putting an overdrive in the Mirada, and also looking at a 408. Just wondering the limitations of my imagined combo.

1969 Dart GTS 340
1969 Coronet R/T X9 N-96
1999 Dodge Dakota R/T RC
2015 Dodge Dart GT
2019 Ram 2500 Big Horn