95 240sx need help

[motoman32002]

ok guys i have a 1995 240sx that i bought with a blown headgasket picked up new motor slapped a tubo kit on it ran fine for 3 days....went to leave and noticed it was skipping unless i got on it hard came back and found the motor was flooding with fuel......it got to the point where it woulnt even turn over(acting like it was hydro locked).....pulled plugs blew a little gas out.....i dont know why but i swapped the dizzy and that went away now it wont crank it tries but just blows out black smoke and wont fire i have good compression its getting spark and fuel....now i took the return hose off and fuel went every where i took the gas cap off and the presure went away now theres no back pressure on the return this is driving me nuts someone please help!!!!!!!!!!!! also if i put the other dizzy back on it floods again but with the other it doesnt????????????wth

[dgms240]

sounds like your timing is off, prob lined the dizzy up wrong. did u set it with cyl 1 at tdc? also, what are you using to tune it?