needing some help on my s13, havin trouble

[Lovest-s13]

Ok, first thanks for reading. I bought my car off a cousin that lived on top of a mountain, and all he said was it had a blown head gasket..soo i changed that and a friend gave me a head that looked in better shape than mine..so i slapped that on and torqued everything to spec....well 3 and 4 cylinders wouldn't hold compression..bought a new head gasket, put the original head back on it..then had A LOT of trouble getting it in time...still can't get it all the way in time..and nooow the 1st cylinder only goes to 50lbs of compression, where 2-4 go to like 150 or 160 i believe..i need some peoples inputs..cause where i live..everyone drives hondas and screams "should've got ya a hondaaaaa!" ugh..

PS..also feelin in body lines..is that a bad idea was told, it'd bust out easily..did one side..holdin off on doing the passenger side..Thanks for reading..i hope someone can help me