I think you bought a really good car to start with. The gentleman that owned it prior, and built it, did a good job from what I can see. That being said, I don't think the car performed the way a lot of people on here might have expected, even with all the changes. In my estimation, the 90+ pages described in the "Fred" post haven't shown anything above what the average guy could expect performance wise from the parts he selected. It's hard for me to give a honest evaluation of performance when I don't have all the facts. At one point, he said the car weighed 3176 lbs. and then he said it weighed 3146 lbs. with fiberglass bumpers, hood and fiberglass deck lid (only 30 lbs. less?). Then it was mentioned where someone said it weighed well over 3200 lbs. in that trim. Then, he dropped the exhaust off and lost who knows how many lbs. along with less restriction. So then, I can only assume it was less than 3100 lbs. (again no idea). After several converter changes, it still never reached a 9 second pass or the MPH that it should have, at the presumed weight (all while being 12.25 to 1 and on race fuel, mind you). I do however, think it would respond quite well to a cam change and that's where I would start.
This build aside, here is my honest evaluation of the flow numbers posted on that sheet. When I see a standard port SBM head with a 2.02" valve at .100" lift and this cross section flowing 70+ cfm, I'm more than skeptical of the rest of the numbers. I know others know this as well. I'm beating a dead horse here, but flowbench numbers don't mean REAL WORLD results! Those numbers may be believable to some, but they don't add up to on track performance. I don't mean to sound abrasive, but it's hard for me to get across to people that what they've read for years in magazines and on the internet is generally bullshit! Marketing information is just that. It's all about getting you to spend money no matter the end result. Just like every weight loss fad or get a bigger dick scheme over the years. Again, what I post are no bullshit results, just actual performance FACTS! If I said my heads flowed 350 cfm it wouldn't change the on track results, would it? How about if I said they flowed 260 cfm? Nope, not a tenth! IT"S JUST AN ARBITRARY NUMBER based on the specific bench it was tested on. Do your research and find out what fits your combination or goals best. I understand that may not always mean spending $ with me, but for goodness sakes, don't rely on advertising and inaccurate information.
Thanks,
Rod