[lnfletcher]

Before going full bore EFI to solve your stumble, try a different carb. I had a stumble I could not fully get rid of with my combination and ended up switching to a vacuum secondary carb and no more stumbling. Stumble is most often is fuel starvation. These are over powered light cars and exacerbate the effects of the feeling. Vac secondary helps with wide open rush of air because the secondary opens on need instead of foot force.