EDIT : the tuning was incorrectly done . Information in the first few posts is misleading . The dyno tuning was redone and gave much better results than indicated in first post Rather skip to Post 14 in the thread For academical purpose here follows my experience : 2F Block overbore 0.060" ( Toyota pistons and rings ) ARP conrod bolts Delta 250S cam SBC valve springs Dyno graph - Efi engine with stock compression ratio ( aftermarket ecu ) As you can see the engine power was still climbing when the tuner stopped the run . In comparison : The carbed engine with higher compression ratio ( 3F carb head with kidney shape chambers and 9,5:1 CR ) I find it strange that the Torque of the carbed engine shows it to be higher at 2000 rpm than with the Fuel injection - when I drive it , it "feels" like there power at lower revs with the new Fi . Strictly speaking the graph of the carbed engine looks like it performs better than the Fi-engine . It was done on two different dyno machines , two years apart . If fuel consumption is lower with Fi then I regard the process as a success - if not ... well I enjoyed the research and development .