Identify Mopar 340

I am posting this for a friend from another message board, he acquired a 340 and is wondering what type of car it came from I will copy and paste all the info that he has posted over there and if anyone can help it would be much appreciated. We are chevy folks and don't know anything about identifying Mopar stuff. If you guys need anything else I will give him a call and see if he can get it. Thanks

I retrieved most of the numbers u asked for-- OK, here goes-- Block casting # 2780930-340B(on L/side of block,near rear)---Cast date(right side block),6/10/71--- Front of block,right below head- HM-340-R, and next to it, 37360253(might be VIN). I forgot to pull valve covers-so I'll pull one tomorrow, and get the numbers on head. I also didn't get to pull the lower pulley from balancer, but did measure it, and look it over. It is a big balancer, solid all around,with no offsets,or weight cuts, measures a little over 7 1/4 inches, and is a little over 3/4 inch thick.

I did get a valve cover pulled, and the casting numbers on the head are as follows. 3418915, near the front of head--- and AAWJ near the rear of head. The casting date on head was 26/3/1(I assume Mar 26,1971).

The VIN would be stamped I believe on a pad on the right side just above the oil pan. Might be able to tell from that.

It's a 72 340 as designate by the "H" from HM on the front of the block.

Grab the VIN off the pan rail as there are a bunch of us, me included looking for missing 340 engines from our cars.

"37360253(might be VIN)."

Not VIN... it's the 10000 day build date and units built
3736 10/20/1791
0253 unit # that day

2631(I assume Mar 26,1971) Actually 263rd day of the 1971 year... should be Sept 20, 1971

Ok, I will see what I can do to come up with the VIN.

Thanks!!