1: hope you would have cleaned the mating surfaces .. i.e. b/w cylinder and crankcase (which i doubt u have done ) // and head and cylinder.
2: you have removed the head but not the cylinder .. did u loosened the nut that is holding the cylinder to the crankcase ? its importoant for proper allignment ...
3: most important .. you are using the shittttttttttttteist every "Head Gasket" do not use this one . use the fiber gasket .. this is damn thick and you will loose a lot on compression ratio .. i had practical experience with it. since you are doint it yourself . i would recomend you to pry that gasket sheets seperate and use first only one thin metalic sheet as a head gasket and if it doesnt the valves doesnt hits the piston or piston doesnt hits the head .. then it will give u awesome compression . and hence power .. do dry run it .. i.e. after proper tightening of the bolts rotate the flywhell then .. if u are sure that there is sufficent clearance then try using few kicks with ignition off .. if there is no bad sound then it means that there is sufficient cleanrnce . then try runing it ..
if one sheet is not giving you enough clearance . then use two sheets .. ( jo steel type ki hothi hain) .. if you still have issue with clearance with two sheets which in my opinion is unlickely .. then use the fiber one ..
4: use little but enough curil between gaskets for perfect seal .
5: tighten the head nuts in a criss cross fashion .. tighten in equal amount .. do not tight them in one go ..