you can use a b17 ecu(but b17's were pre obd so im not sure if it will work if your using an obd1 + vehicle harness), or pretty much any vtec ecu that will plug up to your harness(like a p28) depending on what car its going into(but i would get a tuning program like hondata to ensure a good tune),high compression pistons and rods capable of revving to 7500 and up to take full advantage of the vtec function, aftermarket ls rods, or stock ls rods with arp rod bolts(aftermarket ls rods would be the smarter choice), the brand is all up to you, i am using stock ctr pistons(11:4:1 comp) with the b16 head ill be using it should yield around a 12:1 compression ratio...if you plan on boosting this ls/vtec, use some lower compression pistons.....