Fuel octane on hp 273charger engine 10.5:1 compression .

Jerry6 ... yes the earlier darts are lighter.
I've had several newer style darts67 and up >> I think the earlier darts ride nicer .
My stroker 65 dart rag rides real nice .. it has a mopar sm 402 crate magnum engine .. runs low 11's 1/4 mile.

It a hand full !!!
stays straight as an arrow when I get on her .

I don't see any down faults on this early dart..
you can even get a larger tire up in that rear wheel house.. with out altering .