Seems a little slow...

I have to agree with Joedust451. 1 5/8 headers is a perfect size. I am surprised you think its slow, I know that I am quite impressed. Although, I see some short comings that you can correct and make it faster. First off like most of the replies here, your 60 foot is off and you will et much better with a great 60 foot. Like Joedust451 I think the 650DP may be better suited to your combo since its cubically challenged. The 60's might improve going with a smaller carb but it may trade off some mph. I would be willing to bet it would pick up all around since your mph is low indicating your hp. I am a BIG proponent of the 904, I have done the change twice and both times I picked up .5 and 6 mph with the change which would make you a 13-oh car. I would also be suspicious about the converter, I think you stated you are running a 10 inch that stalls 35-36 hundred. This stall is really high for a short stroke 318. I think tightening up the converter will push your mph up a lot but wont help the 60 foot unless its slipping so bad that you aren't utilizing the torque peak. The original combo you ran sounds like a well thought out combo and I would look elsewhere for your ET. The problem with 3.31 stroke combo is torque, or lack thereof. I ran a 273 that had similar problems, but I was able to get it roight although the converter company was local and they reset the stall like 5 times to get it right. Once it was right it worked great! Good luck!