I have a 351w about to be turned into a 393 stroker that is used for circle track racing. It's already bored 30 over. This past race season was my first ever. I have to use a vacume secondary carb on there and I had an 850 on there with really big jets in it. The Motor was very laggie on the starts at 2500 rpm's. I'm trying to figure out if the 850 is to much carb for my motor or if I could keep it on there for the stroker motor but I have no clue what jets would be a good starting point if it's reasonable to keep it on there. Any help out there for me.