ok... so i got a D15b7 and i got a D16z6 head for cheap. i got all da parts, and mounted it for da first time everything bolted up pretty good. no problems, but it cranks and doesnt start. i had gotten a new dizzy but it was bad. so i changed hopin it was that and nuttin. still no start. i checked da timing once more and it turns out it was retarded so i fixed it and still nothing. so next i checked compression and it read cyl. 1 180, cyl. 2 50, cyl. 3 120, cyl.4 130. so i removed it and reseated the valves cuz my block always had good compression. after reseating them i tried once more put it all bak 2gether and now its actually worse than before. cyl.1 180, cyl.2 50, cyl. 3 60 and cyl.4 60. after these numbers i tried to start it up and it actually started for a sec. it bounced around lyk da ignition timing was off then shut off. and it never started again. ive got fuel and spark but those compression numbers aint helpin lol... any suggestions??? sumthing im missing??? anything would b greatly appreciated... thanx