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I went over to Team Impala and asked the only member of a 1970 454 Impala on that forum about this motor through an email.
He did respond telling me that it is actually a 1970 Vin# for a 1970 Impala/Caprice or Station Wagon.
he also told me that in 1970,the production for the LS5 in an Impala/Caprice or Station Wagon were only 2,459 cars,this is the combined number for 345 HP + 390 HP LS5'S.
There was no SS in 1970 for the above models.
pretty good to know that the motor is a rare one for an Impala/Caprice or Station Wagon guy.
Thanks guys for all your help,i have my question answered.
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Update from above post.
there were 2 different 454'S in the St.Louis built plant for big passenger cars (Biscayne/Caprice/Impala/Station Wagon)
1-LS4 345 HP production total 14,280 units
2-LS5 390 HP production total 2,459 units
=for a total of 16,739 units
There really is not that big of a difference in the LS4 vs. LS5. The comp.ratio, heads, are the same.
The Cam and Rear Gear ratio were different.
Rear gear: LS-4 2.56 LS-5 2.73
Cam shaft: Lift: .3983 I-----.4300E LS-4
.4614 I-----.4800E LS-5
The distributors were different also,with timing being a 2 deg. difference.
thank you Dale from Chevellestuff
thank you Graig from Team Impala
now i have it figured out