need help routing the DHCP requests to another VLAN.

scenerio–have added an additional VLAN to the 3750 and need help routing the DHCP requests to another VLAN.
Here is a brief overview –
VLAN 8
DHCP Server on VLAN 8 everything works fine.
10.10.8.0

VLAN 200
DHCP Server on VLAN 200 everything works fine.
172.16.0.0

VLAN 2
DHCP Server on VLAN 8 – cant get an address.
10.10.200.0

on interface VLAN 2,have configured a ip helper-address of 10.10.8.x which is the address of the DHCP server where the DHCP server has a scope configured for 172.16.0.0. also have IP Directed-Broadcasts enabled on the VLAN 2 interface.Does there need to be an access list set up for VLAN 2 and VLAN 8 to communicate?