Thanks everyone for the input. At rebuild time, I will go all out with a Whipple chiller, roller cam and good heads. For now, gonna put on a smaller pulley and run it this summer like it is.

Have the Whipple intercooler, Dart Pro1 heads and hyd. roller cam. Great set-up. 703hp 738 lbft torque on the dyno by Tyler Crockett. Turn key deal. Don't forget a real good sea strainer/filter for the intercooler, mine has a good stainless mesh filter type.

what did he do to your throttle bodies?

What size heads and cam did you use? that is a lot of power...

The cam is similar maybe a little more aggressive than the 741.

The heads are a JimV's own hand port design head that Dart cast for him using their base 345 Pro1's. I believe they are about 330cc intake runners. I also run these on my NA 454's and will be adding B&M 250's next winter. Here are some pics of when Jim and I went to the foundry the day they cast them. It was a neat experience, something you don't get to do every day.

He had the injectors cleaned, flowed, and made sure all were equal. Rebushed throttle shafts. Narrowed throttle shafts to flow more CFM. Tack welded blade screws. We could have went farther with the bodies and ported them but felt we would see how this worked.

Sean did the throttle bodies on my 575's too. Great guy to work with & does an awesome job. I know this is an old thread, but I had to give a thumbs up to Sean & SPR. Great experience!