4100 Carb Problems
okay, I think before we go on too much further with this, it's time to get more info on the engine itself...you say you put in small block jets, well then I assume it is a small block you have in it, but what displacement (260, 289, 302, 351?), what about the cam you are running? exhaust system? timing? Give us as much info as you can/know about the set up...and we may all be able to get you a few more ideas about what could be ailing that carb of yours.
Like Cupcake said, the big block variants of the 4100 don't always work well on small blocks (however, I ran a 4100 from a 390 on my .20 bored over 302, running stock cam for 1983 and 9.0:1 compression, and it ran fine after I discovered the bottom vacuum leaks)...the 1.08 is better suited to smaller displacements, and surprisingly you can still get some decent ones off Ebay..so keep looking!
But first, get us the important details so we can all make a better diagnosis on the carb problem.