CM7-Ascend - Prepaid Android
First off Ascends are bi-polar. So when looking at the builds on that page no he may not be able to run or boot some. Try the 0912 it may be too much for his phone and it wont even boot. It has a 748mhz kernel in it alot of phones cant run that kernel. If not try the 0913 build. It has a 710mhz kernel in it.
If he cant run either, then there is a 672mhz kernel on that page. Flash it after you flash the rom and gapps.
The 0912 and 0913 builds are stable and have actually been around since 728 their just updated with some tweaks here and there. Those 2 roms are both Gingerbread 2.3.5. Oh and they are CyanogenMod roms that were ported to the Ascend by Issacj87 and maintained by Playfulgod