explosions on my 318..

My car had a slant six in it. After i finally killed it i decided to put the 318 in it.
I opened the 318 and it has new cam, new timechain, new lifters, pushrods, carburetor was completly rebuilt, new condenser, cap, sparkplugs, cables, fuel filter.
From what im thinking that could be reasons, these components are new. Now its not burning excessive smoke, or blue nor white.
I installed the motor at the end of january, with everything that i mentioned. I started doing it since i started driving, i messed a little bit with the a/f ratio and it went away very little, but im at the point where if i lean it more it will not be good. So my other option was timing... :roll:
Thanks!! :grin:


easy enough to check