While
this is a very common exchange, one must be aware of what engine is
being used.
Buick,
Olds and Pontiac all offered 455 engines and all three had different
weights
Buick's
weighted 600 lbs., Olds 620 and Pontiac's 640 lbs.
The
403 used in 1979 was a Olds engine which weights 560 lbs.
So
the source of the replacement engine will have a bearing on the springs
used.
If
the replacement engine were a Pontiac engine then our part numbers for
the springs without AC is MC6450 and the P/N with AC is MC1214. Either
set is 165.00 plus shipping.
