you should be running 10.0-10.10's with your combo.

I ran 10.85 @ 126 mph off the trailer, no tuning.
436'' w2 heads, 13.1, tunnel ram with 650's, 660/632 lift and 277/288@.050. 4.30 gear, 28'' tire. 3800 lbs

first thing I would change is convertor. i picked up with my swap in convertors. my car felt sluggish and i knew it had a lot more in it.