So I got my car dyno'ed today. It ended up putting down 332hp and 340tq on a mustang dyno. It ran around a 12.5 afr with 30 degrees of spark. Next time I go i'm going to try 12.8:1 and a few more degrees. I was expecting slightly bigger numbers, was I asking too much?
A Mustang dyno typically records numbers 6-7% lower than a Dynojet. Therefore you could have got about 355rwhp and 365rwtq on a Dynojet which is very good for a 331. Unfortunately it looks like you're spinning away too much power at the tires 'cause with that amount of rwhp you should have been in the low 12's.