Horse power and torque of a 1970 340 Duster

[scustalow]

Also what rear end ratio it should have?

 

[72ScampTramp]

thats a pretty vague question. Is this stock? Has it been modified in its lifetime? The rear ratio could vary you will have to check for a tag or spin the pinion.

 

[demon seed]

Here, knock yourself out.:book:

http://www.hamtramck-historical.com/dealerships/1970PlymouthDealershipDataBook-05.shtml

 

[EL5DEMON340]

should have a 8.75, probably 50/50 open and most likely a 3.23