I have a 98 ranger 3.0 just replaced the heads now on first startup in the morning it cranks like it out of timing but when it finally fires up it runs fine when the engine is warm it cranks and starts fine any ideas

 

Welcome to the forum

Not sure what you mean by "out of time".
Does the engine fire but only now and then while cranking?

You could have pressure leak in the Returnless fuel system.

On cold start
turn on key count to 3 then turn key off
Repeat 3 more times
Then try to start

Each time the key is turned from off to on the fuel pump will run for 2 seconds, but only 2 seconds, it is a safety feature.
1998 Fuel injection needs above 40psi pressure, if should be 60psi, if pressure is dropping to 0psi when engine sits for a few hours then engine can't start with just 2 seconds of pressure added, 10psi.
Cycling key on and off will build pressure back up, once engine starts fuel pump will come on full time, raising pressure up to 60 to 70psi

1997 and older rangers used 30-40psi fuel systems, Return style

 

what I meant to say was it cranks like the firing order is wrong

 

Could be

Ford coil pack wiring on 3.0l(and 4.0l) is:
3 4
2 6
1 5
front

The 5 6 4 side is often miswired
or wires at 5 6 4 spark plugs are