SCRAPIN & PANKAKIN - Lowering Rear SUSPENsion Ideas 76 Dart Sedan

It won't lower it as much as a lowering block, but you REALLY don't want a 5" lowering block.

I'd look for a suspension place nearby that can 're-arch' your springs and get you close. Then fine tune with a lowering block.

I've got the two-hole hanger and springs that are near a zero arch at rest. Car sits pretty nicely I think.
Sweet!
Doesn't look much lower than mine.