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I just bought a 80 4x4 LUV that was not running the guy I bought it from had his brother put in new seals in most of it including the head gasket and timing chain.But they never got it running.So when I got it in the shop I set the ignition timing and ajusted the carb and it started and ran with some missing and spluttering.After I got it running I found out the tranny was bad so I also pulled the engine and replaced the oil pan gasket and main seal,also found that when they replaced the timing chain they must not put the retaining ring on the tentioner so it had come off and the chain was loose also the head bolt torques and valve lash were all over the place.So I set all that right and put the engine back in,it starts right up and revs fairly good to about 28-2900rpms then starts to miss and splutter. The ignition timing is right I tried it with the ignitor,with the points,different caps,roters it has good wires and plugs and seems to be getting good spark. Another thing when I got it I checked compression and it was 145-150ish on all cylinders now its down to around 110 120.My question is could it be that the chain was not installed right or that it jumped?If so how could I check it without taking the cover off?Or is it the head gasket? Thanks for your help in advance.

Does indeed sound like the valve timing could be off by one tooth. Factory manual explains it good as I remember.
Basicly rotate engine untill timing mark is at zero, with the distributor rotor pointing to #4. Behind the cam sprocket is a line or dot on the shaft that points to a triangle/arrow like symbol on the bearing holder. I'm going from memory here so bear with me. When installing the chain the driving side needs to be straight and tight from the lower to the upper sprocket with the marks lined up.
The tensioner takes up any slack on the other side. Hope this helps.

I had another engine sitting around so I took the valve cover off and when the marks on the cam line up, the crank is at 16.So to make this engine the same I had to move it two links. The truck runs way better but I'm wondering should it be at 0 when lined up on all marks?If so I should have only gone one link.

Usually best to go with the factory exact setting, (move the chain one link). If the cam is off one way you will have more low RPM power at the expense of high RPM power. The other way will be vise versa. Factory setting is usually the best compromize. If you can't seem to get it close enough by moving the chain at the top sprocket, just move one tooth on the bottom which goes half the distance because of the smaller sprocket.