1981 ford f-100 replaced motor firing ,rolls over

The engine turns over but won't start, If you suspect the lifters, I guess I would start by checking the compression. You should have at least 80 lbs. of compression, actually it should be up over 100 lbs. But, if you've been trying to start it the gas probably has the cylinders washed clean of oil. The important thing is that compression is close to the same in every cylinder. While you have the plugs out squirt a little oil in the cylinders (outboard motor oil or chainsaw oil works the best). Did you have the distributor out, did you get it back in right? With the spark plugs out, hold your finger over the front spark plug hole and have someone bump the starter until you feel compression in that hole (by bump I mean turn the key to start for just a partial second). When you feel compression in the the front cylinder, STOP, now turn the engine by hand and line the timing mark up on the front pulley with TDC or zero. You shouldn't have to turn the engine more than just a little, now remove the distributor cap the rotor should be pointing to the number 1 plug wire. If all is good, loosen the clampbolt enough so you can rotate the distributor body a little each way. Will the engine start now? The engine turns over but won't start, If you suspect the lifters, I guess I would start by checking the compression. You should have at least 80 lbs. of compression, actually it should be up over 100 lbs. But, if you've been trying to start it the gas probably has the cylinders washed clean of oil. The important thing is that compression is close to the same in every cylinder. While you have the plugs out squirt a little oil in the cylinders (outboard motor oil or chainsaw oil works the best). Did you have the distributor out, did you get it back in right? With the spark plugs out, hold your finger over the front spark plug hole and have someone bump the starter until you feel compression in that hole (by bump I mean turn the key to start for just a partial second). When you feel compression in the the front cylinder, STOP, now turn the engine by hand and line the timing mark up on the front pulley with TDC or zero. You shouldn't have to turn the engine more than just a little, now remove the distributor cap the rotor should be pointing to the number 1 plug wire. If all is good, loosen the clampbolt enough so you can rotate the distributor body a little each way. Will the engine start now?