I did dual exhaust first, and I felt a nice improvement in get-up and go. Then came the O.D., radials, HEI. In that order, one at a time. Each step yielded big gains. It's a different truck now, and I have yet to install dual carbs but am going too. I will be using 2 NOS Rochester Bs -(against a lot of experienced advice telling me I shouldn't), and an Edelbrock 2X1 intake. And after that's done, I will be swapping the 235 block and head, with a built 261 block and head.
