Stock 340 dyno tests?

I dug up my old Direct Connection Performance Book from 1980 and used the Weight/HP vs MPH chart to calculate the HP my 340 made when new.
The '68 FS FB 340 weighed 3050 or so with the back seat out. I weighed 185 or so back then in 1970. The car turned consistantly 13.50's at 105 with a best of [email protected]. Using the DC chart, 105 MPH converts to 11.5 lbs/hp. With a weight of 3250, this translates to 285 HP. The DC book on page 1332 shows a stock 340 should produce 275-290 HP, so this is about right.
Interestingly, Chart 6 on Page 1332 show what ET is possible with the proper chassis and transmission setup. A stock 340 with a race weight of 3250 should turn 12.70's in the quarter mile. Stock with tires, torque converter and good driving. Not bad.