by Astre-mutt » Sat Aug 07, 2010 5:22 pm
The carb you have now should be good for your engine. This carb is rated up to 300hp out of the box. Not sure what your tuner means by "upping the jets from where they are now, won't have any improvements". Getting the car off lean condition will be an improvement. There may be a horse power increase with a bigger carb at the top end, but only by sacrificing the low end performance.
This is part of a quot from one of the websites I use for Holley tuning.
"The factory determines jet sizes using several factors on each carburetor, including the air bleed size, the venturi size, booster venturi size and shape, and the power valve channel restrictions. So if you find that your car will not run properly with a jet that is within 5 sizes one way or the other of the factory recommendation, you have problems somewhere else, like a bad or misadjusted float, bad needle and seat, a vacuum leak, a dirty carburetor, or a plain old worn-out carburetor. "
I would stick with the carb you have now. I would check that there is no vacuum leaks, and that the float level & accelerator pump are adjusted properly. If those are good, and your running the stock jets in the car. Then I would increase the primary jets up by two sizes bigger, and see if that takes care of the lean condition. If it doesn't I would look other places for the problem.
Scott
76 Astre panel express