that one?
http://www.holley.com/0-8007.asp

should do on a stocker alright

 

yep , that's the one. don't have a tuning dvd though. at least not yet.

 

i still wish you had a bigger carb, your going to be leaving a lot of power on the table. i built a 4.3 chevy V6 for a friends truck and we tried a holley 390 and a carter 500 on there. the 500 was definitely faster and made more power and that was on a smaller motor than what you have.

 

i had a mild 289 with 2b 300cfm and the only difference with the 570 was above 4 grand
(at least according to seat in pants dyno) so I believe with a stocker that won't make power after 5 grand he'll be very good with that thing

 

There's really no way to know which has better performance until you stick the thing on a track and test the theory.