How much would I lose?

goldmember said
You'd likley hurt it up top with the intake change but your cam is smallish(are your sure the LSA is 104?) But I don't see a problem running mid 11's in an A body(3100-3200lbs) with 3.23 gear. Years ago I had to slow my junky 408 A body down(no roll bar,street car) and the way to do it was leaving in second gear and disconnecting the secondaries on the carb,it ran 11.50's @ 117mph in detuned condition. A good converter will cover some issues as well. I'd recommend a good(not expensive) 904, PTC converter and 3.55's with 26-28" tires and mid 11's or better are cake.

Awesome! That's what I like to hear! I thought the lsa sounded odd at 104, I purchased the cam from another member on here. I took the numbers off of the back of the cam and called comp, they emailed me the spec card. I actually emailed them again, recently, about getting a cam that would bleed off more pressure, and the one they recommended was almost exactly like this one! lol. I think the cam was spec'd originally for a circle-track style 340, as it had w2 heads, but a small 500cfm alcohol carb. Right now, I have a new (well, rebuilt with good parts) 904, I would just want to put a manual vb in it. I wanted to go with a 26" tire, and well, your combo is really close to what my original plans are/were! Thanks for the input! What size carb would you say would be a good match for this? Also, do you think it would run those times with the dual plane? If so, I'm all for getting it.