OK, this is a stock 300 in a Chevrolet Corvair Truck as mid engine. The Trans is a ST400. I only adjusted the timing a bit for better idle and starting. The carb is a Rochester 2GC from a 66-67 Pontiac. We bought a 1964 300 engine with aluminium heads and intake to save some weight on the front suspension. So in the next weeks I plan to take the 1964 engine apart, the pre owner told us that that one rod is damaged. I will check the heads and 2bbl intake, maybe do some porting. We get the original 1964 carb with it so we will use this one. I want to learn more about the Rochester 2bbl, so I will take the Pontiac version apart, clean it and see what tuning options I have. I have a AED 650 HO carb on my Chevy. I changed the high speed air bleeds (I cut a thread in to do this), idle air bleeds, changed the main jets and idle feed restrictor too. I'm using an Innovate O2 sensor on our cars for tuning. So I want to use it to tune the 300 too. I also want to change the distributor from stock points to electronic. I also have experience in recurving the timing.