I believe mikes stock mugen mount works:
http://www.rc-monster.com/proddetail...=RCMmugenmount
A 4s 5000mah lipo with a Medusa 60mm 2000kv would work fine - Bashing aim for about 40mph - 16T pinion would work.
Use this script:
http://scriptasylum.com/rc_speed/_top_speed.html
Differential Ratio: 3.3076923076923075
Transmission Ratio: 1
Other Ratio: 1
Spur Tooth Count: 46
Pinion Tooth Count: 16
Total Voltage: 14.8
Motor KV: 2000
Tire Diameter (inches): 4.5
Tire Ballooning (inches): 0
Motor Current Draw: 0
Motor coil Ω: 0
Spur/Pinion Ratio: 2.88 : 1
Total Ratio: 9.50962 : 1
Tire Circumference (inches): 14.14 inches (359.08 mm)
Total Motor Speed: 29600 RPM
Vehicle Speed: 41.67 mph (66.94 km/h)
Estimated Adjusted Speed: 39 mph (63 km/h) - 5% loss
Effective KV Value: 2000
PS There are quite a few stickies and the search thing works well on the site if you want to research batteries and trays etc