First I am not sure when you say two WAN connections, do you meen two different paths,interfaces to the same ISP, or two different routers to the same ISP. Most likely second one.
If so, in reality you have two choices.
1. No need for BGP. Use static routes and redistribute them to EIGRP. However, in this case, you could blackhole the traffic if remote end interface is up, but it itself is blackholing it due to its IBGP sessions within ISP going down.
2. Run EBGP, but since it is the same ISP, there is no need to run full BGP table. Have them advertise you only default route. Then take that route and readvertise it into EIGRP, from both routers. Additionally, have your ISP do some policy modification to assure they don't blackhole you. In this case as long as BGP is up, and redistribution to EIGRP is good, EIGRP will pick better cost to each of ASBR's 0/0 route. In the case one of the BGP peerings goes down, 0/0 will be removed from the database.
However, the best scenario would be if you could do your EBGP peering with two different ISPs, preferably ones who have different ISPs themself, so you would have a better change of redundancy.
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