This is the article , just take the HP numbers with a grain of salt , time that was done that dyno was known to be giving out INFLATED numbers .
Regardless, the delta vs the bone stock engine dyno'ed on the same machine serves as useful information. My 69 Coronet ran 13.20's with a stock magnum 383 with bolt on torker, 750dp, and headers. 3.91's and 8" cheater slicks with a 3000 stall.
I don't want to bring out the BS meter but bone stock? as in a 383 cam, stock from the factory pistons, heads and all you did was add a convert (huge help) headers, intake carb and gears? 13.20? Is that corrected? I had a built 383 w/ real 10.5:1 compression, balanced blue printed engine, ported 915 heads, 509 cam, 3200 stall, torker, 3.91's and a 750DP in a 69 Charger and the best et I saw was 13.11 @ 104..granted I was on BFG's but 13.20's w/ just bolt ons is really good.
Ron...