I have a B20b in my 91 tegg. I have a B16a2 head that I am having redone, 5 angle valve job, new guides, rockers. I know I need the vtec conv. kit, but do I need to replace pistons,rods,crank, or can I get away with just pistons, I also already have the apexi v-afc controller also. And what kind of ecu, would I have to go for. Or can the crv ecu be chipped . Any help would be I would be grateful for.