I wouldnt hesitate throwing the 750 E. on their until you get another carb... I been runnin a 750 on my lil 351M for a few years. Something around 600+/- would probably be better, but it seems to work just fine for me, and I rarely get into the secondaries, heck I barely touch the pedal for the most part. Actualy got better mpg after some tuning than the stock carb too.