Since you had to pull the heads off you might have done something you didnt mean to, like knock a vacuum line off, broke a wire or just missed something when putting it back together. I always do a final check for everything when I do any type of work like this. If you know that everything is put back together right, then check for spark and fuel pressure.
Well try removing the distributor and spin it around half way 180 degrees then try. it seems you are off there are two ways to install the distributor because two turns for the crank equal one for the distributor.if still wont start call on me again i will help you .
Get a timing light, connect it to battery and #1 cylinder. While cranking over engine (need a 2nd person for this) you point light at the timing marks on the crankshaft pulley. Everytime #1 fires, the light will flash and you should see the tick mark aligned with the stationary mark. If this is not the case, then you may just be 180 degrees out of timing. This means that the #1 cylinder was at the wrong stroke at top dead center when you set the timing. put everything back to the position that you set it by manually rotating engine. This will realign your (possibly wrong) marks. remove the timing belt/chain. roll engine crankshaft manually until #1 comes back up to TDC then put timing chain back on. Try to start it up then. This happens to a lot of people. You may have put the #1 cylinder at the TDC of the exhaust stroke, not the compression stroke.
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i rotate the distributor 180 degrees but still won't fire.double checked spark,fuel connectors.
it either cranks and when i turn the distributor,it backfires.
frustrated.grrrrrrrrrr
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