Without the accellerator you have more than enough cooling in there now.
The A3000 desktop that I used to run my BBS on had an 040/35Mhz, 2 HDs, and a couple of cards (A2065 Ethernet and MFC3) and only had the P/S fan and the small CPU heatsink and fan. I never had a heat related problem, and this system was on 24 hours a day for more than 4 years.
