Just wondering if 2 hours is enough transit time in BOM

if
1. Arrive at international terminal 0330 (March 4)
2. Clear Immigration and Customs
3. Need to catch a flight out of the domestic terminal at 0530.

Assuming no delays in incoming international flight - should I even risk this?

Also does anyone know if the inter terminal shuttle bus run 24*7 - and whats the frequency? Or would a pre-paid cab be better at that time (given that I will only have 2 hours!)