Is the new engine standard or modified?
If your seriously considering spending 10k on mods then you could do a complete overall of the suspension. Coilovers, antirollbar bars, replace all drop links and bushings etc. Tein flex Z and miestrr and bc Coilovers all have good recommends. Let's say go all out and spend total 2.5k the other, 7.5k could be useful for forging the engine and might see u push mid to high 400s on the power