You think even with the replacement block the four bolt is an issue I've read that it's better suited to four bolt mains and if so would a girdle be the way to go?
The ad says 1972 block. That's what I'm going by. In 72 all you had were T/A blocks out of a car, or T/A blocks that came from a Chrysler dealer. If it's a T/A block jump on it.
If it is a replacement 340 block, it will take a 4 bolt cap. I'm not a fan of girdles. Just use main studs. If you are making over 550 HP buy aftermarket 2 bolt caps. Much over 650 and you need an aftermarket block if you want ring seal and bearing life.