You can use EG/DC2 suspension on the EF too, but the front shock is 1 inch longer, but if you have height adjustable coilovers, then its not a problem. Just adjust it to suit.

You may need to change the rear lower control arm so the rear shocks fit. Dont know if all DC2/EG model have the same LCA's. Unless you got a 88 model, it came with the same LCA as the DC2R & EG6 came with.