I lived up in the Tyler area and commuted into Dallas while finishing my Master's degree (go SMU!)...the only 'vintage' yards I remember are Henderson's, located off Hwy 175 between Kemp and Kaufman and CTC Auto Ranch up near Denton. I believe there is another yard, loosely associated with Henderson's just southeast of Kemp (between Kemp and Cedar Creek Lake), but was told it was private and 'by appointment only.'
K&K in Graham, Tx. Used to be able to stroll thru but not any more. Insurance won"t allow. Can call about cars and parts. Can't remember web. site. Nice folks-profesional.