383 in 68 Dodge Dart? new build

the wieght thing is a never ending argument. its really not a big enough difference to worry about it. a simple torsion bar swap to the proper size bars will take care of it. i ran my bigblock dart for years on the street with slant six bars. they make torsion bars way bigger than necessary for the street reguardless of engine size. there are some pretty big sway bars available too. my big block car handles really well and was done on a tight budget.