I picked these heads up last week. Got 2 sets of heads one box opened other 3 unopened.
I found nothing on net about heads. Lots of porting and bowl work done. Also check out NOS block!
The short block was done by Custom auto in Weymouth ma. Best time of 11.29 at 122mph, I think the car will run in the 10s, It runs better now, Just haven't got back to the track.
69 340 Stroked to 416, India 205 heads. Demon 775 Carb, 727 Trans. 8 3/4 Rear with 4.56 gears. Car has Title and is Registered. But would rather sell for racing Purposes or parts.
$24,000
So if the j81 option is dealer installed, How did the j81 get on the fender tag? seems more likely j81 was factory ordered then installed by the dealer to prevent damage in shipping.