They are pretty much all the same, only difference is vtec and power numbers, hence B series engines, basically same size, only small differences. I would suggest doing a b18b buildup or even an ls/vtec setup but for you i wouldn't recomend it.
What are your goals for the car?
Turbo? keep the ls or swap the b18c if you have the dough.
N/A b18c5, higher compression, more hp.
Also what is this going into? I'm assuming an rs/ls/gs integra?
IMO and no body conversions are necessary.
:laughing1: