www.designscomputed.com/auto_pub/a_body_68_72.html
This poster has been out awhile and gives best educated guess on 70 SS converts as....
L34 - 1088
L78 - 46
LS5 - 91
LS6 - 95
A similar 70 LS6 convert with body off resto sat at a dealership in MO for quite awhile....same color combo but probably not the car in question as it was stated as a clone. I last saw it at another dealership website recently but can't remember which one.