The xe274h is what I have. I like it a lot. Its in a 340/416, stock X heads (had to change the valve springs) and about 9.5:1 compression, headers, airgap/eddy 750, and a 4 speed. It sounds lumpy at idle but makes plenty of power from idle to at least 6000 rpm. Its a great street cam, especially with the stroker crank. If I were to spend any more time at the track, I think I would go up a step to the xe284 or maybe something from the high lift series.
I had the xe268 before the current setup in a stock 340 with the 340 exhaust manifolds and that ran really well also. Its a big imporvement over the stock cam.
Let me know if you have any specific questions.
