I don't have time to look for the threads, but the general consensus I recall reading was that the cam/head combo left A LOT to be desired on the 290 horse motor and they weren't worth the extra money.
I have the lower HP one on my stand right now. I bought it over 3 years ago when Jegs had them on sale for $1,208.
http://67-72chevytrucks.com/vboard/s...d.php?t=606983
Also, the 250 and 290 numbers are "max" with 4 barrel carb, hei, headers, etc. As mention above the "stock" motor is more around 195 HP with a 2bbl carb and stock components.