Hi, I recently replaced the head gaskets on my 1991 EB Ford fairmont. The other day I tried to start the car, it cranks over ok, but willnot start... Any ideas.. Thanks..

Check spark to each plug and fuel pressure to the rails via the little check valve (looks like a bicycle valve stem) at the front of the fuel rails, also check the TFI module on the distributor

Also double check distributor timing

has it run since fitting the head gasket and if so did it run fine, if you are trying to start for the first time since replacing the head gasket check that the coil lead is on right, check through all the wiring, making sure the injector loom is plugged in, if it has run and then stopped it may not have anything to do with the gasket change