You would be better off starting with a resin body of a 70 Chrysler 300 and then modifying it into a Newport.
1970 Chrysler 300 2-Door Hardtop - R&R Resin
1:25 Scale
1970 Chrysler 300 2-Door Hardtop by R&R Resin.
Includes one piece body, chassis, interior tub, taillights, bumpers, grille...