routing traffic on two serial interfaces to the same ISP

Currently I have four blocks of IP's: 80, 81, 82, and 83.

I have two T-1 lines coming into one router with two serial interfaces.  One t-1 line each.  I have already told my ISP to only route traffic to 80 and 81 to serial0 and 82 and 83 to serial1.  How do I do the same on my end?  I want all traffic from 80 and 81 to use serial0 and 82 and 83 to use serial1.  

I've tried using access-lists, but that seems to slow down internet connection.  Do I need route-maps?  Any help would be greatly appreciated.  Thanks.
pnl4goodAsked:
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PennGwynCommented:
Access lists are going to block traffic that tries to go the wrong way -- that's not what you want.

Routing is normally done based on destination address.  To route based on source, you need some kind of "policy-based" routing.  I believe route-maps can do it.

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