Hi Sam, Is that the original engine?
Where was the VIN# stamped on your engine, was it stamped on the front of the
engine or on the back by the oil filter. The 3969974 is the Original STD bore piston
for a 70/L78. The PN should be stamped on the top of the dome on the piston. The
block and head casting dates are usually within a few weeks of one another.
BTW, That’s a
"Real Nice" car you have there.
Mark L