The factory made a SD version of the 4 cyc.Used a 306 head,a alu 4 bbl intake and SD AFB carb.It used a solid lifter cam.All of these parts are impossible to find these days.You wont be able to get your cam reground for rollers.Might be able to get it reground for solids.Isky reground my cam for hyd lifters.When you put in the screwin studs and go to a oil thru the rocker system you really dont have to block the feed in the block as there is not place for the oil to go.You should look into better rods when you do the build.If your going to want to run street pump gas you will need to watch the CR.I raced a 4 cyc back in 62 when all the hipo stuff was avail.Now people will look at your from Mars when you open the hood,ask where the rest of your engine is.Good luck with your project.In reality the easiest way to get a lot more HP is the turbo.The 389 SD engine was 368 HP so if you half that your at 184 HP.Tom
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