Well as for a O/H kit they all seem to be made by only a couple places . Last OEM kit we got as per customer request were Clevit pistons with and I H part number stamped in the top but casting numbers were Clevit . If the head gskt. is weeping on the left side then i would say that you have found your problem along with a little warpage in the head . I will tell you tis if you pull the head spend the extra and get a head set from Case I H as the gskt that comes in it is far better then what you get from the parts store . There is something about the Victor Gskt that they supply and never ever use a fel pro btdt . When you do pull the head get a 1/2 13 bottoming tap and chase all the head bolt holes in the block , check each and every head bolt and run a thread chaser over them and run them across a wire brush . Myself i use a Light coat of white grease on the threads and i clean the holes in the block with brake kleen and blow dry . torque the head down in three stages and go over the final torque twice once the engine is back up and running let it run and get up to operating temp and retorque Watch adjusting the valves as the ends on the rocker arms ware funny and you have to watch that you do not get the feeler gauge under the part that is not wore as you will get a false set . Any temp above 70 degrees is warm enough to set valves . Watch your ing. timing as you set it at full throttel for full advance and on a 263 that is 23 degrees BTDC. While you have the head off make sure that you are a C263 and it has not been up graded to a C291 over bore. Then things change .Have the head checked for being true and have it lightly dusted just enough to get it flat, nomore then it needs .
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