HELP! Gas is comming out my exhaust!

[Supa_dupa_man]

Alright, So I just got my motor rebuilt again, for the 4th time in its life. I just threw on an oem MLS head gasket, but im still rocking all my forged internals, and my hot cams... Im going to stay N/A for now, until I get the car running good, and the motor broke in real good.

I finnaly started the car today,
I drove it to town and came home (about 30 miles total) shut it off and let it sit for a few hours.

I went outside just a bit ago to drive it again and it had a super hard time starting, It chugged and chugged and It sounded like it was missing on one cylinder, and I have White smoke comming out my exhaust... after a little bit, i noticed some kind of fluid leaking out of the little crack in my header, I shut the car off and put some of the fluid on my finger to look at it and smell it... It was gas... Any Ideas on what I might have done wrong, or something broke?