4.3L help getting started!!?

i have a 1995 gmc sonoma with a 4.3L vortec it got hot and fried my heads so i replaced the heads and a few sensors cap rotor plugs and wires put it all back together and went to time it and its a edi distributor so i put it up on compression stoke went to the next notch on the dampener and pointed the rotor to the number 6 castd in the dist. tried t start it up it cranks but no fire and back fires sometimes im not 180 out i checked over and over again i have 150 compession on all of the cylinders exept the num 1 which is only 115 anyone have any ideas?