I used a thumpr cam, hr 235/249/107 in a 408 stroker smallblock. The EQ iron heads flowed 272 @ .600, with great midrange numbers. The motor has an airgap intake, 850 Quickfuel carb, 10.1 compression, and the cam is at 105, rather than the recomended 102. It made 504 hp at 5700 rpm, and 519 tq at 4700. I use a true 4,000 stall converter, and in a 65 dart the thing is a beast. Properly set up with slicks, i have a good idea of it being able to run hi 10s.
If you look at circle track cams, the LSAs are very narrow in a lot of cases, because they don't need to worry a rats butt about manners below a certain rpm, like 3,000 rpm for instance. That is pretty much what you get with a thumpr cam. It is best to use the max compression you can though, to help offset the early exhaust opening of the thumpr cams. Also, matching the converter or running more gear ratio in a stick car will work much better given the extra overlap these cams have.