help with my 240sx situation, please

[bransonfink]

Car: 93 240sx
I replaced the head and both cams ( bought off a member from nico forum)
all mating marks are lined up both on lower and upper timing chains. Everything is set at TDC
I am not sure of mating marks on crankshaft and lower timing chain since I didnt need to go that far to replace the head and cams. I did forget to hold back the tensioner when I first removed the Idler sprocket, but kept the chain from falling. Tied the chain off and placed a wood spacer against the tensioner and side wall(so it wouldnt expand) and continue working. I put head and cams in place, put in correct shims for both cams, check clearance, all OK, all mating marks were lined up , distributor is set on #1 firing position.
Fuel pump reactivated and injectors reconnected.
Car turns over good but wont fire, checked spark from plugs, all working
Ran compression test without sparkplugs in any cylinders, but only got a reading of 90 PSI on all cylinders. If valves weren't seating properly would I get the same reading on all 4 cylinders??????? I would think some readings might be low and others high. I think that either an intake or exhaust valve is slightly open on the upward compression stroke before it fires allowing some air to escape and giving me low reading. FSM says min. 150 to max. 180 at 300rpms
Anyone have any suggestions???? Any information would be helpful
Thanks

[Sugar]

I would say double check the timing, something must have not been right. The engine was in good working order prior to swapping the head?

[truckboy]

Start with the basics, check your fuel filters first . Remove the fuel line from where it comes into the filter (It will be marked In and be located on the bottom of the filter) then have someone look and see when you crank the engine whether or not fuel is coming through the line. If there is no fuel it is a good sighn your pump is bad and needs replacement. However if you have fuel coming through the line replace your gas line on the IN side of your filter and test the out going line on the top of the filter or OUT side. If the fuel is not coming out when you crank the engine or is but at a lower / slower rate replace your filter. If your filters are in good working order and your pump is delivering fuel to the lines yet still wont start it could be a senser problem. If it is, you should be getting a check engine light. If this is the case try to get it into a sevice station and hook into there computer to get the error code. Last thing, if your car was spudering or stalling prior to your starting problem and all of the above is in good order it may be that your pump though working is not delevering enough presure to the lines. I hope this helps a little good luck.