Personnel Placement

We are changing from a 4-4 to a 3-4, but our personnel is really 4 down linemen. The one OLB is really a big, athletic DE-type kid, while the other is a LB-type.

My question is: should I play the big kid over the TE and the LB-type to the SE side OR should I simply play one as a field OLB and the other as a boundary OLB. If I go with field/boundary placement, who should play where?

I appreciate any advice and rational.

Thanks....