Need stock 318 flywheel for 70 dart

I quit riding on the street when my buddy bit it big time, a woman done a U-turn on a 4 lane road, took him out.
it's one of my two big loves in life, my a body and my bike. it's gonna be hard, the darts awesome but was in no way economical and the bike even if hopped up gets 45 mpgish. California's weather means I can ride dam near all year round