mileage on your car
162,000 on the 273 in my wagon, never opened with the exception of the performer intake/carb I installed to replace the leaking stromberg. It really needs a timing chain, valvestem seals, and a gasket kit....the 904 has some morning sickness as well.
The dart is showing just over 100,000 but the original 225 had a giant hole in the side/top of the block where rods #4-5 introduced themselves when I got it.
The neon has somewhere around 180,000 on it and only NEEDED a headgasket at 165,000....I wound up doing an in-frame with DOHC pistons and a 49,000 mile Magnum head and oil pump off the same 'parts' engine.