I actually have both A7V333 and 8k3a+. I really like the performance of AX-7(the 80CFM delta fan can be very loud; my wife complained so much so I install a Rehobus from PC mods to control the fan speed. It is a very nice 4 channel fan controllor).
It is little easier to put it on A7V333 (now is in ASUS's RMA department; it fried my 1900XP during BIOS reflash, which is very odd but it also happened to another person in this forum).
My AX-7 now is performing very well on my 8k3a+. There are few capacitors quite close to the CPU socket but you should be able to handle that.
The only little thing is that I installed A7V333 first and drilled 4 fan holes on my side pannel. One of the holes is the CPU duct fan hole. CPU location on 2 motherboards are little different; so, my duct channel is not right on top of the CPU for 8k3a+ now. Even though, the cooling is still quite good. I will do some modification later to fix the alignment issue.
XP 2000 @ 12.5x153 (2.05V)
Kingmax PC2700 (2.8V)
Coolermaster ATC-210 mod with 8 fans
2 IBM ATA100 HD
Leadtek Geforce3 Ti500
Dual BIOS from ISSO (one for aggressive setting; one for safe setting)