The 1990 block would have the integrated one-piece rear main seal. Oil pan and crankshaft are not interchangeable.
42
1 year
On the Block - 1990 is rated/received certificates of: USA:R
New Kids on the Block - 1990 The New Kids on the Old Block 1-8 was released on: USA: 3 November 1990
New Kids on the Block - 1990 Rewind Time was released on: USA: 1990
New Kids on the Block - 1990 Overnight Success was released on: USA: 1990
On the Block - 1990 was released on: USA: October 1989 (Independent Feature Film Market)
Back of the block under the intake. Accessible from between the exhaust pipe and CV shaft.
It appears that they only circulated 3,600 in 1975.
Wheel of Fortune - 1975 1990-01-04 was released on: USA: 4 January 1990
Wheel of Fortune - 1975 1990-12-25 was released on: USA: 25 December 1990
New Kids on the Block - 1990 is rated/received certificates of: USA:TV-Y7