likely out of a demon or duster
3375 build date 10/24/1970
That would be a 1971 high compression Thermoquad motor, the fastest stock 340 motors made
I think the '70 340 Six Pack engine might have something to say about that.
find one and try it and see
I used to help Gene Buh l(SP?) run his NHRA stockers, the 340 6 pack Challenger was faster than his 1971 Demon 340 car, but NHRA put more HP on the 6 pack motor after he set the C/SA record with it
I think they made his car have 5 more HP on that engine HP factor than the 1971 Thermoguard motor did, they didn't add the HP to the 1970 AAR Cuda, the T/A Challengers only
He ended up quitting drag racing in the stock classes after that last factoring on him, he got into 4 wheel off roading and jeep trail rallies