James
Something is bugging me.Have you seen this block in person and are those numbers authentic?
That VIN# on this block is not a 1967 Corvette as I said earlier it was.
The 1967 Corvette VIN started at #100001 in Sept. 1966 and ended at #122940 in July 1967.
1968 Corvette VIN#'s started at #400001.
Yours of #170958 does not fit into this,as well as the letter "T" in front of it.(That's TerryTown,New York Plant and only the BIG Passenger cars were built there)
Have you seen this block in person to rule out any foul play of the stamping?,because if not,I would believe it was orginally scheduled for a 1967-68 Impala,although then the IU doesn't make sense,But IJ was the suffix for the 427 Impala,or IV for the 396 application...