72 Swinger engine swap: power per dollar?

I would try to find if I were you a 87-91 360. Its a Roller LA block.
I have been lookin for one to no avail around me but maybe you will have better luck

Im currently throwin a 440 in a 74 Valiant 4 Door. Worst thing is the exhaust and mounts unless you use Schumacher conversion mounts.

The Schumacher mounts are nice and have them installed in my 74 Dart Swinger with a 360 with TTI Headers and they held up to it just fine and fit like a glove