[SS427]

Actually the VIN will tell you an approximate build date of the car (can't read it on the cowl tag) and that will eliminate one or the other of the LS6 or L78. The L78 ceased production on or about October 30th, 1969 and the LS6 began on that same date. The car's rear axle and/or trans codes will tell more about what it is assuming they are original which they likely were not in this car as it appears to be modified.