1970 duster clone. need opinions.

let's start with the underneath. do you have any pics from underneath? the rear axle is easy to identify. an 8 3/4 rear will look like a smooth round ball from the back looking at it from the rear bumper.no bolts holding a cover on will be seen as well. engine identification is pretty easy as well. do you have any pics of the fendertag? it is the little metal sitting on the inside of the fender on the drivers side inside the engine compartment. the vin number of the car will have a letter in the fifth digits place. in other words ( ex. lm28h) this letter will tell you what the cars engine was originally. the next number following the letter will be a number. like a 0,1,2,3,4, ect... this will be what year the car is really. on the engine it will have a number on it on the block. i forget what side it is on (passenger side i think) there will be a bunch of numbers on it followed by 3 numbers to the right of the numbers. these 3 numbers will be either 318 , 340 ,or 360. this will tell you what cu.in engine is in it now..... post some pics of the inside of the trunk, underneath , fendertag, and anything else like rust. let us see these and we can help further....