What I'm trying to get across to you is the difference between a VS and a DP carb and how much harder the latter will hit, size matters also, you open up the heads to breath better you need more carb than a 750. I ran an 850DP on my 340!!!. Run the car with what you have and then borrow an 800>850>950DP if you can and you will see/feel the difference with that PTC verter.