Buy the b16a, then procede to pull the head off. Then fully dissasemble the b16a shortblock. Pull your LS out. Remove the LS head, then procede to completely dissasemble the LS shortblock. Take the LS crank, LS rods & pistons, B16a rods & pistons, b16a head, and the LS block to a god machine shop. Have the b16a pistons put on the LS rods. Have the LS block honed. Have the LS crank micropolished. Have the b16a head checked over. Then get all the parts back. Order a set of rings( .010" oversized) and file fit them for each bore @ .010" on the top ring and .012" on the second ring. Order LS ARP rod bolts and install. Order a set of LS ACL bearings. Plastigauge the bearings, make sure they are no looser than .020" and no tighter than .010". You want them to be as close to .015" on the mains and .017" on the rods(IMHO). Order cometic LSvtec 81mm .030" thickness headgasket. Use a Brand NEW ITR oil pump, GSR water pump, and GSR timing belt. Slap the B16a head on the fresh High compresion LS shortblock. Install CTR cams and ITR valvesprings with your choise of brand titainium retainers. Get a good crome tune and be very happy with 200whp NA.