Unless your exhaust is very restrictive, I'm going to predict running open headers is going to slow you down.
You might be able to get it solid into the 14s now just with tuning. Start working on the ignition timing stuff and fuel curve.
I think open headers will be worth 20 to 30hp the last car I raced with open headers then put a headman mufflers on lost .3 of a second my brother's car who I was racing at the time also lost 1/2 seconds with the exhausts back on!
Anyway next year when I have a posi I will have do a few runs with exhausts on and open headers my prediction is faster on open headers and a what a V8 should sound like!
I may have gained a few tenths loading the TC but then again I may have just got loads more wheel spin. Until I get a posi axle sorted it will be a lottery leaving the line. I want to be able to give it full power and be able to load the 30000 TC to the max until I pushing the brakes.
With the right gears I think I may get it into the 13's but that will have to wait until next year!
I do need to tune the carb as I am running rich now strange as this carb and intake were just right on the 326!
67 Firebird 350, TH350 auto Convertible, B&M 3000 TC, 4bbl Edelbrock Performer carb and intake Black Jack headers,disc brake conversion. 10 bolt chevy axle with 3.73's and B&M Rachet shifter.
