The LT1 was modded quit abit but my cusion was still usin the factory that be modded. And for the 700R4 there not that bad if u get them rebuilt with a shift ki, for carb i would go with holley or demon cause cause edelbrock carbs are a piece of sh!t they leak quite frequently from the infromation that i got from the perfromance shops here and my uncles friends that built funny cars (dragsters).