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 Overnight Success was released on: USA: 1990
New Kids on the Block - 1990 Rewind Time was released on: USA: 1990
It appears that they only circulated 3,600 in 1975.
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.
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