A 265 crank is the speed equipment that I'd like to locate for my 25" Mopar. Improve the oiling, balance the internals, upgrade the camshaft. The 265 will run strong with good torque. Lighter modern pistons would also be a good idea.
I have considered a turbocharger. I think 6 pounds boost would work if the block was built right and the head was o-ringed. Each pound of boost will increase the power output about 10 percent, with the greatest increase being in the mid-range. A turbo motor would not have to run above 3,500 RPM to have a significant power increase.
I have the ideas, I don't have the money
