As stated, that car definitely has some major issues. I know of bolt-on LT1's going faster than that with more MPH...

 

Your dyno numbers aren't that bad considering the issues you still need to take care of. Mine dynoed 363 rwhp with 4 year old ARE heads and a gm846 cam, through a 3200 converter and slp shorties. My car is full weight and my best times are listed in my sig.

FWIW, I think you're probably leaving another 20-30 rwhp on the table, so don't get too discouraged until you get that thing sorted out. Good luck.

 

I think those mid legnths+the exhaust leak they have are killing your power...plus not to mention the issues you were having before prob fouled out those o2's you got...I'd say...get some long tubes, an off road y-pipe (no cat of course) and some new o2's and ull be flying.

 

Remember all the little things can cause serious issues.... I talked to Denny McLain the other day and his mysterious missing 20rwhp was due to a header leak that you couldn't even hear or find. Simple stupid things can cause so much problems in terms of making power that it's hard to get it all together and running right if you have them.

http://raceology.com/2004/10/10-powe...void-them.html

That's a good article that will help ya get some more ideas...

Bret